https://sipfront.com/blog/ Recent content in Telecom Testing Insights from the Sipfront Blog on Automate your telecom tests for reliability Hugo en-US Fri, 11 Sep 2026 22:50:52 +0200 https://sipfront.com/blog/2026/04/automated-ai-voice-agent-testing-systematically-detecting-voicebot-error-scenarios/ Fri, 17 Apr 2026 06:41:50 +0000 https://sipfront.com/blog/2026/04/automated-ai-voice-agent-testing-systematically-detecting-voicebot-error-scenarios/ Voicebots and AI voice agents are crucial interfaces in customer service. Their performance and reliability directly impact customer satisfaction and operational costs. To systematically test a new voicebot for error scenarios and drop-offs, an automated approach is essential. Manual tests are time-consuming, prone to human error, and often overlook important edge cases. Without precise testing, voicebots can respond slowly, act as mere talking FAQs, or prematurely terminate calls. Problems such as latency, lack of load stability, or unstable interfaces are often the cause of voicebot project failures. https://sipfront.com/blog/2026/04/how-to-test-a-webrtc-connection-effectively-in-2026/ Thu, 16 Apr 2026 21:12:32 +0000 https://sipfront.com/blog/2026/04/how-to-test-a-webrtc-connection-effectively-in-2026/ Testing a WebRTC connection effectively involves a combination of browser-native diagnostic tools, network analysis, and specialized third-party platforms. WebRTC, enabling real-time communication on the web, relies on a complex “handshake” between peers, often traversing Network Address Translators (NATs) and firewalls. Therefore, comprehensive testing must cover both the signaling phase and the media flow to ensure robust and reliable communication. This guide outlines how to test your WebRTC connection like a professional. https://sipfront.com/blog/2026/04/what-is-mos-in-voip/ Thu, 16 Apr 2026 20:48:06 +0000 https://sipfront.com/blog/2026/04/what-is-mos-in-voip/ VoIP (Voice over Internet Protocol) services are integral to modern communication. Ensuring high-quality voice transmission is critical for business continuity and user satisfaction. The Mean Opinion Score (MOS) in VoIP serves as an industry-standard metric for quantifying this perceived voice quality. It provides a numerical representation of how listeners rate the clarity and overall experience of a call. This post will explain what MOS in VoIP is, how it is calculated, the factors that influence it, and why understanding and optimizing your VoIP MOS score is crucial for maintaining service stability and enhancing operational efficiency. https://sipfront.com/blog/2026/04/what-is-the-real-time-transport-protocol-rtp/ Thu, 16 Apr 2026 20:43:26 +0000 https://sipfront.com/blog/2026/04/what-is-the-real-time-transport-protocol-rtp/ The Real-time Transport Protocol (RTP) is a fundamental network protocol engineered for the real-time delivery of audio and video data over IP networks. It forms the backbone of numerous real-time communication applications, including Voice over IP (VoIP), video conferencing, and media streaming services. RTP typically operates over the User Datagram Protocol (UDP) to prioritize low-latency transmission, crucial for interactive communication. It incorporates essential mechanisms for sequencing, timestamping, and payload identification to ensure smooth and synchronized multimedia playback. https://sipfront.com/blog/2026/03/the-critical-blind-spot-why-voice-ai-load-testing-is-non-negotiable-for-contact-center-operations/ Mon, 16 Mar 2026 21:30:33 +0000 https://sipfront.com/blog/2026/03/the-critical-blind-spot-why-voice-ai-load-testing-is-non-negotiable-for-contact-center-operations/ For VPs and directors at the helm of contact center operations, the integration of Voice AI promises significant gains in efficiency and customer satisfaction. However, a pervasive and dangerous blind spot often emerges: the actual performance and customer perception of these intelligent bots under real-world conditions. What appears stable and high-performing in controlled staging environments can quickly degrade in live customer interactions, leading to unpredictable service quality and profound customer dissatisfaction. https://sipfront.com/blog/2026/03/head-of-growth-fmx/ Thu, 05 Mar 2026 18:00:00 +0200 https://sipfront.com/blog/2026/03/head-of-growth-fmx/ Location: Vienna/Austria (on-site preferred, hybrid supported) Job Type: Full time Experience: 5+ years in SaaS Sales / Sales Ops Skills: Sales Process Design, CRM Architecture (Pipedrive/HubSpot), MEDDIC/Challenger Frameworks or similar, SDR/AE Management, Marketing/Sales Alignment, Data Analytics (SQL/BI is a plus). Salary: 90k€ base to 140k€ OTE annually, plus employee stock options Apply: jobs@sipfront.com TL;DR Sipfront is looking for an analytical Head of Growth to transition our sales engine from founder-led to a scalable machine. https://sipfront.com/blog/2026/01/baresip-gemini-live-voicebot-deepdive/ Thu, 29 Jan 2026 07:00:00 +0100 https://sipfront.com/blog/2026/01/baresip-gemini-live-voicebot-deepdive/ Following our exploration of OpenAI Realtime, we now turn our attention to Google Gemini Live. While both platforms aim to provide low-latency, conversational AI, the underlying “nervous systems” have distinct characteristics. At Sipfront, our deep dive into the code allows us to compare these giants not just on their features, but on their raw technical behavior. The Initialization: Ephemeral Auth Tokens Similar to OpenAI, Gemini Live uses a short-lived token for secure client-side authentication. https://sipfront.com/blog/2026/01/baresip-openai-realtime-voicebot-deepdive/ Wed, 28 Jan 2026 10:00:00 +0100 https://sipfront.com/blog/2026/01/baresip-openai-realtime-voicebot-deepdive/ In our last post about Voice AI, we introduced the high-level architecture of building a Voice AI bot using baresip. Today, we’re going deep into the “nervous system” of the bot: the OpenAI Realtime API implementation. At Sipfront, we don’t just use these tools; we tear them apart to understand exactly how they behave under stress. This know-how allows us to build the most robust test automation for our customers’ voice bots. https://sipfront.com/blog/2026/01/sipfront-secures-1.8m-seed-round/ Mon, 26 Jan 2026 15:00:00 +0100 https://sipfront.com/blog/2026/01/sipfront-secures-1.8m-seed-round/ As organizations worldwide pour billions into Artificial Intelligence, quality assurance has emerged as the critical bottleneck for wide-scale deployment. Sipfront, the pioneer in test automation for telecommunications, has closed a €1.8 million funding round to solve this Trust Gap in the Voice AI space. Markus Seidl (CTO), Andreas Granig (CEO), Daniel Tiefnig (COO) | © Carolin Bohn Led by Amsterdam-based growth specialist Airbridge Equity Partners (AEP) with renewed support from tecnet equity, the investment will accelerate the expansion of Sipfront’s platform for Enterprise Voice AI. https://sipfront.com/blog/2025/12/ai-voicebots-with-openai-gemini-and-baresip/ Mon, 01 Dec 2025 16:00:00 +0100 https://sipfront.com/blog/2025/12/ai-voicebots-with-openai-gemini-and-baresip/ The rise of Voice AI has been nothing short of impressive. We’ve moved from clunky IVR systems to fluid, conversational agents powered by LLMs like OpenAI’s GPT-4o and Google’s Gemini Live within a year. While some popular platforms and open source projects like Jambonz, Asterisk and Freeswitch start to offer high-level abstractions to build these bots, sometimes you want to see how the sausage is made. You want to understand the raw mechanics of connecting a telephone call to an artificial brain. https://sipfront.com/blog/2025/08/sipfront-launches-ai-voicebots-for-testing/ Fri, 29 Aug 2025 17:00:00 +0200 https://sipfront.com/blog/2025/08/sipfront-launches-ai-voicebots-for-testing/ Voice AI assistants have become ubiquitous in modern customer service, but testing them effectively remains a significant challenge for developers and operations teams. Every voice bot developer knows the frustration of manually placing dozens of test calls to verify their bot’s behavior, responses, and call flow logic. This manual testing approach is not only time-consuming but also prone to human error and inconsistency. Today, with OpenAI’s Realtime API becoming generally available, at Sipfront we are setting out to solve this challenge by launching our own AI-powered voice bots that can autonomously test both inbound and outbound voice assistants. https://sipfront.com/blog/2025/07/how-to-test-ai-voice-bots-comprehensive-guide/ Fri, 04 Jul 2025 10:00:00 +0200 https://sipfront.com/blog/2025/07/how-to-test-ai-voice-bots-comprehensive-guide/ AI voice bots have revolutionized customer service and automated interactions, but ensuring their reliability requires comprehensive testing across multiple technical layers. From the initial phone connection to the final synthesized response, each component in the voice bot pipeline presents unique challenges that can significantly impact user experience. This guide explores systematic approaches to testing every aspect of an AI voice bot implementation. Understanding the AI Voice Bot Pipeline Before diving into testing methodologies, it’s crucial to understand the complete data flow in an AI voice bot system: https://sipfront.com/blog/2025/07/what-is-jitter-demystifying-its-impact-on-network-traffic-and-real-time-communication/ Wed, 02 Jul 2025 10:00:00 +0200 https://sipfront.com/blog/2025/07/what-is-jitter-demystifying-its-impact-on-network-traffic-and-real-time-communication/ Jitter is a term frequently encountered in the realm of networking, especially when dealing with Voice over IP (VoIP) and other real-time communication technologies. Simply put, jitter refers to the variation in latency - the time it takes for data packets to travel from one point to another — over a network. Unlike static latency, which remains relatively constant, jitter describes fluctuations and inconsistency. Formally, jitter can be defined as: https://sipfront.com/blog/2025/07/understanding-mos-network-vs-audio-quality-measurement-in-voip/ Wed, 02 Jul 2025 08:30:00 +0200 https://sipfront.com/blog/2025/07/understanding-mos-network-vs-audio-quality-measurement-in-voip/ Mean Opinion Score (MOS) is a widely adopted metric used to evaluate voice call quality in VoIP systems. Typically ranging from 1 (bad) to 5 (excellent), MOS provides a simple yet effective way to measure how end-users perceive voice communication quality. Network MOS Network MOS is calculated using Real-Time Control Protocol (RTCP) statistics collected during a call session, including jitter, packet loss, latency, and codec choice. It provides a quick estimation of quality based on network conditions. https://sipfront.com/blog/2025/06/understanding-post-dial-delay-pdd-in-sip-impact-and-optimization-for-pbx-systems/ Thu, 12 Jun 2025 14:51:00 +0200 https://sipfront.com/blog/2025/06/understanding-post-dial-delay-pdd-in-sip-impact-and-optimization-for-pbx-systems/ Post Dial Delay (PDD) refers to the time interval between the moment a user completes dialing a number and when they hear the first indication that the call is being processed — typically a ringback tone or a progress announcement. In SIP-based systems, PDD is the period from the initial SIP INVITE sent by the PBX until the first SIP 18x (180 Ringing, 183 Session Progress) or 200 OK response is received. https://sipfront.com/blog/2025/06/testing-conversational-chatbots-with-g-eval-and-deepeval/ Thu, 05 Jun 2025 00:21:00 +0200 https://sipfront.com/blog/2025/06/testing-conversational-chatbots-with-g-eval-and-deepeval/ Modern conversational AI requires robust evaluation to ensure that chatbots provide relevant, helpful, and safe responses. Traditional NLP metrics like BLEU or ROUGE are ineffective for chatbots because: There is often no single “correct” reply (many plausible answers). Multi-turn context and memory matter. Aspects like tone, appropriateness, and factuality are important. G-Eval (LLM-based evaluation) and DeepEval (an open-source testing framework) provide practical tools to address these challenges. Why Standard Metrics Fall Short Reference Overlap Fails: BLEU/ROUGE compare to a reference, but in open conversation, good responses can differ widely in wording and meaning. https://sipfront.com/blog/2025/03/automating-calls-on-real-mobile-devices-with-bluetooth-hfp-on-a-raspberry-pi/ Thu, 20 Mar 2025 12:12:00 +0100 https://sipfront.com/blog/2025/03/automating-calls-on-real-mobile-devices-with-bluetooth-hfp-on-a-raspberry-pi/ In many QA and automation scenarios, you want to place and receive real calls on an actual mobile phone. You might attempt to control the phone via UI automation (e.g., scrcpy or Appium), but quickly discover that audio is inaccessible. That’s because the phone’s native dialer routes the audio directly from and to the modem to its speaker, headphones and mics — bypassing audio interfaces you might be able to tap via ADB. https://sipfront.com/blog/2024/06/account-executive-f/m/x/ Sun, 09 Jun 2024 11:00:00 +0200 https://sipfront.com/blog/2024/06/account-executive-f/m/x/ Location: Vienna/Austria Job Type: full time Experience: 3+ years Skills: technical telco/SaaS sales, cold outreach, German, English Salary: 52 k€ - 150 k€ annually, plus employee stock options Apply: bewerbung@sipfront.com About the role Join Sipfront as Account Executive, driving our international sales efforts! At Sipfront, we automate testing of real-time communication services for telecom operators and vendors. Their operations teams will know at all times what works in their system and infrastructure and what doesn’t, giving them peace of mind in their daily routine and full information when something happens. https://sipfront.com/blog/2024/05/addressing-the-telco-workforce-challenge/ Tue, 28 May 2024 14:00:00 +0200 https://sipfront.com/blog/2024/05/addressing-the-telco-workforce-challenge/ The telecommunications industry is facing a significant workforce challenge, as detailed in a recent report by PwC. The growing talent gap threatens the ability of telcos to maintain high-quality services and keep up with technological advancements. High infrastructure investments and stagnant revenues have forced telcos to optimize their workforces, often through reductions, leading to a shrinking pool of skilled professionals. To address this issue, telcos need innovative solutions that optimize their existing workforce and improve operational efficiency. https://sipfront.com/blog/2024/04/senior-voip-engineer-f/m/x/ Sat, 13 Apr 2024 09:15:00 +0200 https://sipfront.com/blog/2024/04/senior-voip-engineer-f/m/x/ Location: Vienna/Austria, Remote Europe Job Type: Full time Experience: 5+ years Skills: SIP, RTP, Networking, Linux, Docker, AWS/Google Cloud, Customer Support Salary: 84 k€ annually, plus employee stock options Apply: jobs@sipfront.com About the role Join Sipfront as Senior VoIP engineer, supporting our customers test projects! At Sipfront, we automate testing of real-time communication services for telecom operators and vendors. Their operations teams will know at all times what works in their system and infrastructure and what doesn’t, giving them peace of mind in their daily routine and full information when something happens. https://sipfront.com/blog/2024/03/specific-placement-of-agents-using-agent-groups/ Fri, 08 Mar 2024 09:00:00 +0100 https://sipfront.com/blog/2024/03/specific-placement-of-agents-using-agent-groups/ When using Sipfront to test your infrastructure, you leverage Sipfront agents to originate and terminate the test traffic such as phone calls via SIP and RTP, WebRTC calls, or simple DNS requests or test traffic to measure and test your bandwidth. How Sipfront agents work by default Sipfront agents are grouped into agent pools, and you can use agents from public agent pools operated by Sipfront, or create your own agent pools and launch your own agents at the locations of your choice. https://sipfront.com/blog/2024/02/cross-browser-webrtc-testing-with-audio-analysis/ Sat, 17 Feb 2024 12:00:00 +0100 https://sipfront.com/blog/2024/02/cross-browser-webrtc-testing-with-audio-analysis/ Do you develop or operate web-based WebRTC applications allowing your users to perform phone calls, such as a web-based soft-phone or unified communication web interface? Are you thinking beyond the test scope of only using Selenium to check if your UI is showing the right call states, and struggle to check if you actually got two-way-audio and measure its call quality? Then this one is for you! We just rolled out a new Browser Test Scenario to perform automated and scheduled test calls from your WebRTC web applications to SIP endpoints and vice versa, including the capturing of call states, media statistics and SIP/SDP traces. https://sipfront.com/blog/2024/01/sipfront-closes-pre-seed-financing-round/ Wed, 31 Jan 2024 16:15:00 +0100 https://sipfront.com/blog/2024/01/sipfront-closes-pre-seed-financing-round/ 1.3 million to improve telecommunications quality Andreas Granig, Markus Seidl, Daniel Tiefnig | © Carolin Bohn Andreas Granig and Daniel Tiefnig sold their first company Sipwise to Alcatel Lucent Enterprise in 2018 for a double-digit million amount. A few years later, they founded Sipfront together with Markus Seidl. From SIP to 5G Sipfront is solving problems that already exist today: the often inadequate quality of phone calls and video conferences. But now, with the spread of 5G and IoT, there is also a rapidly increasing use of networked devices and sensors, particularly in logistics, warehousing and industry. https://sipfront.com/blog/2024/01/running-docker-on-odroid-c4/ Fri, 19 Jan 2024 12:00:00 +0100 https://sipfront.com/blog/2024/01/running-docker-on-odroid-c4/ At Sipfront, we run telco tests within Docker containers. They might be hosted in the cloud (such as AWS Fargate) or on big bare metal servers, but some use cases require us to deploy small hardware test agents in end customer environments. In that case, we rely on Odroid C4 boards because of their reasonable CPU and network performance. The problem with the stock kernel We don’t build our own images, but rather rely on the stock Ubuntu 22. https://sipfront.com/blog/2024/01/feature-update-january-2024/ Mon, 08 Jan 2024 12:00:00 +0100 https://sipfront.com/blog/2024/01/feature-update-january-2024/ The feature requests we heard most over the last weeks were to improve the per-test reporting and to allow failed tests to re-run automatically and immediately. We heard you, so here is what we came up with. Try out now Report test history per project Based on the global dashboard, we reworked the reporting of tests within test projects to make the history of individual tests more visible. The last 25 test runs have been replaced with a clickable spark line for quick access to run details. https://sipfront.com/blog/2023/09/sipp-and-responses-matching-reply-codes-by-regex/ Thu, 21 Sep 2023 23:00:00 +0100 https://sipfront.com/blog/2023/09/sipp-and-responses-matching-reply-codes-by-regex/ At Sipfront, we use sipp to perform load tests for our customers’ infrastructure. The systems under test can be anything from a simple PBX to a powerful C4 or C5 or a flexible CPaaS, and their behavior might vary heavily. In this blog post, we’ll look into how we use sipp to match SIP response codes as dynamically as possible to fit sipp scenarios for most purposes. A basic sipp scenario A typical SIP UAS (user agent server) scenario to register at a SuT (System under Test) in order to receive subsequent calls looks like this: https://sipfront.com/blog/2023/09/setup-visqol-for-aws-lambda/ Tue, 19 Sep 2023 11:00:00 +0100 https://sipfront.com/blog/2023/09/setup-visqol-for-aws-lambda/ Introduction This blog post describes on how one can set-up a Docker environment to cross-compile VISQOL for Amazon Linux 2. What is VISQOL VISQOL stands for Virtual Speech Quality Objective Listener and is an objective, full-reference metric for perceived audio quality. Why Visqol? Contrary to PESQ and POLQA, VISQOL is OpenSource and can be used under Apache-2.0 License. Step 1 - Set Up To pull the image, just paste docker pull amazonlinux:2 to the command line. https://sipfront.com/blog/2023/09/sipp-and-opus-negotiating-a-dynamic-codec-id/ Thu, 14 Sep 2023 23:00:00 +0100 https://sipfront.com/blog/2023/09/sipp-and-opus-negotiating-a-dynamic-codec-id/ At Sipfront, we use sipp to drive the SIP signaling part of our load tests, because sipp gives us the flexibility to craft our desired SIP messages, and it’s unbeaten in signaling performance. We do not utilize it at all to drive the RTP generation (that’s handed off to kamailio and rtpengine), but we do use it to negotiate the codecs to be used in the RTP stream. In this blog post, we’ll look into how to negotiate the OPUS codec using sipp in an SDP offer/answer. https://sipfront.com/blog/2023/08/web-developer-f/m/x/ Wed, 09 Aug 2023 20:45:00 +0200 https://sipfront.com/blog/2023/08/web-developer-f/m/x/ Location: Vienna/Austria, Graz/Austria, Remote Europe Job Type: Full time Skills: Modern web development frameworks (React/Vue/Angular..), Postgres Salary: min. 3,551€ gross monthly for 38.5 h/week (IT KV) + fair overpayment + employee stock options Apply: jobs@sipfront.com About us At Sipfront we automate the testing of telecom services. We simulate calls for our customers and check, among other things, whether the connections are established and whether the call quality is right. By automating the test processes, our customers can offer their services more cheaply, faster and with higher quality. https://sipfront.com/blog/2023/07/best-practices-monitoring-your-sip-soft-switch/ Mon, 17 Jul 2023 01:50:00 +0200 https://sipfront.com/blog/2023/07/best-practices-monitoring-your-sip-soft-switch/ Monitoring your SIP soft-switch is crucial for maintaining the optimal performance of your communication infrastructure. By implementing best practices in monitoring, you can ensure that your system is running smoothly, identify potential issues before they become critical, and make informed decisions to improve your network efficiency. In this article, we will explore the various aspects of monitoring your SIP soft-switch and provide practical tips to help you stay on top of your communication network. https://sipfront.com/blog/2023/05/senior-solutions-architect/ Tue, 30 May 2023 20:45:00 +0200 https://sipfront.com/blog/2023/05/senior-solutions-architect/ Location: Vienna/Austria, Remote Europe Job Type: Full time Experience: 5+ years Skills: SIP, RTP, Networking, Linux, Docker, AWS/Google Cloud, Customer Support Salary: 72 k€ annually, plus employee stock options About the role Join Sipfront as a senior solutions architect, as we grow from the co-founding team! At Sipfront, we automate testing of real-time communication services for telecom operators. Their operations teams will know at all times what works in their system and infrastructure and what doesn’t, giving them peace of mind in their daily routine and full information when something happens. https://sipfront.com/blog/2023/04/golang-logging-directly-to-aws-opensearch/ Mon, 03 Apr 2023 11:00:00 +0100 https://sipfront.com/blog/2023/04/golang-logging-directly-to-aws-opensearch/ Why we care about Golang For us at Sipfront, it is crucial to use the latest and most advanced tools and technologies to stay ahead of the competition. Go’s unique features, such as its fast compile times, built-in concurrency support, and strong type system, enable us to create robust and scalable software systems that can meet the demanding needs of modern applications, microservices and distributed systems. The following page is intended as a small documentation with suggestions/tips on how to set-up a logger for Go, that logs directly to OpenSearch via the logrus package and the official opensearch-client. https://sipfront.com/blog/2023/03/how-to-create-hundreds-of-datadog-monitors-with-a-few-lines-of-code-in-terraform/ Fri, 10 Mar 2023 08:30:00 +0100 https://sipfront.com/blog/2023/03/how-to-create-hundreds-of-datadog-monitors-with-a-few-lines-of-code-in-terraform/ About this blog post Monitoring the performance and availability of your infrastructure is crucial for ensuring the smooth operation of your applications and services. At Sipfront, we are fully dedicated to monitoring telecommunications systems 24/7, with functional and performance tests at your service. This will give carriers and developers peace of mind so desperately needed. That raises the question: who watches the watchmen? We monitor our own infrastructure 24/7 as well of course, and our tool of choice for this task is Datadog. https://sipfront.com/blog/2023/02/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-3-ingesting-traces-via-heplify/ Thu, 23 Feb 2023 08:57:00 +0100 https://sipfront.com/blog/2023/02/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-3-ingesting-traces-via-heplify/ In our previous blog posts of this series on how to deploy Homer on AWS, we discussed the motivation and architecture to deploy Homer the capturing of SIP messages in kamailio Scope of this blog post In this article, we will focus on how to ingest the captured traffic into your Homer database at scale by leveraging ECS auto-scaling. We will not go into details about chosing the right database and tuning it to handle the traffic. https://sipfront.com/blog/2023/01/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-2-capturing-traffic-in-kamailio/ Sat, 28 Jan 2023 00:26:00 +0100 https://sipfront.com/blog/2023/01/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-2-capturing-traffic-in-kamailio/ In our previous blog post, we discussed the reasons why to deploy both passive monitoring and active testing measures in your Telco network. I outlined our requirements that we have at Sipfront, as well as our high level architecture how we deploy Homer as passive monitoring solution. Scope of this blog post In this blog post, we will focus on how to capture SIP traffic and send it off to our Homer instance. https://sipfront.com/blog/2023/01/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-1-intro-and-architecture/ Sun, 22 Jan 2023 23:00:00 +0100 https://sipfront.com/blog/2023/01/how-to-deploy-homer-with-homer-view-on-aws-ecs-part-1-intro-and-architecture/ Two of the corner-stones of Telecom Operations are passive monitoring and active testing. Passive monitoring helps to troubleshoot issues when they appear by capturing the network traffic and present it via a user interface, so operations engineers can search for calls, view signaling flows and drill down into the signaling messages. Active testing on the other hand is simulating end user calls and measuring their various metrics to verify if call scenarios properly work and the quality is within your requirements. https://sipfront.com/blog/2023/01/why-automated-call-tests-will-ease-your-job/ Tue, 10 Jan 2023 00:40:00 +0100 https://sipfront.com/blog/2023/01/why-automated-call-tests-will-ease-your-job/ As a telecom operation manager, you have a lot on your plate. From ensuring that your network is running smoothly to handling customer inquiries and complaints, your job is never done. That’s why it’s so important to have tools at your disposal that can help you save time and reduce stress. Automated call testing is one such tool that helps you easing your mind and improving your network’s performance. First and foremost, automated call testing allows you to run tests on your network on a regular basis without having to dedicate any time and resources to the process. https://sipfront.com/blog/2022/12/simulating-e911-calls-with-sipp-kamailio-and-rtpengine/ Fri, 02 Dec 2022 22:40:00 +0100 https://sipfront.com/blog/2022/12/simulating-e911-calls-with-sipp-kamailio-and-rtpengine/ Our core expertise at Sipfront is testing complex call scenarios, so I got really excited when I recently received the following request: Could you simulate an E911 emergency call like this with a multipart-part/mixed body and an SRTP stream, to test an emergency server implementation of ours? Of course one could run off and implement its own dedicated SIP client, perhaps using pjsip or something similar. At Sipfront, we rather lean towards generic solutions you can easily script, and since our framework already includes sipp, kamailio and rtpengine, a different idea took shape. https://sipfront.com/blog/2022/11/software-developer/ Mon, 21 Nov 2022 06:00:00 +0200 https://sipfront.com/blog/2022/11/software-developer/ Location: Austria Occupation: Senior / Junior Software Developer Job Type: Full-time / Part-time / Potential internship Skills: Any modern programming languages (Python, Go.. ) Salary: 55 k€ to 75 k€ annually, plus employee stock options.1 100% Home Office is possible About the project At Sipfront, we automate testing of real-time communication services. To achieve this, we simulate phone calls and video conferences for our customers and check if connections get established and quality matches expectations. https://sipfront.com/blog/2022/10/research-student-machine-learning/ Sun, 09 Oct 2022 06:00:00 +0200 https://sipfront.com/blog/2022/10/research-student-machine-learning/ Location: Austria Occupation: Bachelor- or Master thesis Job Type: Full-time / Part-time Skills: Python Salary: from €2.635 per month (paid 14 times per year) / 38.5h per week About the project At Sipfront, we automate testing of real-time communication services. To achieve this, we simulate phone calls and video conferences for our customers and check if connections get established and quality matches expectations. For our research project, we are looking for a Research student - Machine Learning Specialist (f/m/d) https://sipfront.com/blog/2022/09/efficient-api-querying-a-case-study/ Tue, 27 Sep 2022 00:00:00 +0100 https://sipfront.com/blog/2022/09/efficient-api-querying-a-case-study/ At Sipfront, we offer automated VoIP tests for telecom systems. Besides the System Under Test, the internet has the biggest impact on a test. Internet outages or re-routing due to e.g. natural disasters can result in lost or delayed network packages. We combine real-time information about the internet with cutting-edge machine learning methods to estimate its influence a the results of a test. This helps us to deliver focused insights and recommandations to our customers. https://sipfront.com/blog/2022/06/internship-machine-learning/ Sun, 12 Jun 2022 06:00:00 +0200 https://sipfront.com/blog/2022/06/internship-machine-learning/ This position is no longer vacant. Have a look at our current openings! Location: Austria Occupation: Internship Machine Learning / Data Analysis Job Type: Full-time / Part-time Skills: Python Salary: from €2.635 per month (paid 14 times per year) / 38.5h per week About the project At Sipfront, we automate testing of real-time communication services. To achieve this, we simulate phone calls and video conferences for our customers and check if connections get established and quality matches expectations. https://sipfront.com/blog/2022/06/research-student-security-architect/ Tue, 07 Jun 2022 18:45:00 +0200 https://sipfront.com/blog/2022/06/research-student-security-architect/ Location: Austria Occupation: Bachelor- or Master thesis Job Type: Full-time / Part-time Skills: Javascript, Python Salary: from €2.635 per month (paid 14 times per year) / 38.5h per week About the project At Sipfront, we automate testing of real-time communication services. To achieve this, we simulate phone calls and video conferences for our customers and check if connections get established and quality matches expectations. For our research project, we are looking for a Research student - Security Architect (f/m/d) https://sipfront.com/blog/2022/06/senior-full-stack-engineer/ Fri, 03 Jun 2022 20:45:00 +0200 https://sipfront.com/blog/2022/06/senior-full-stack-engineer/ Location: Vienna/Austria, Remote Europe Job Type: Full time Experience: 3+ years Skills: Javascript (Node and React/Angular/Vue), Databases (PSQL or MySQL), Cloud (AWS or GCP) Salary: 55 k€ to 75 k€ annually, plus employee stock options. How to apply const AWS = require('aws-sdk'); const nodemailer = require('nodemailer'); async function applyToPosition () { let cvContent = "Stuff I've done the last years goes here"; let text = "I'm available for the senior fullstack position, let's talk! https://sipfront.com/blog/2022/05/sipfront-secures-seven-figure-research-funding/ Tue, 31 May 2022 16:50:00 +0200 https://sipfront.com/blog/2022/05/sipfront-secures-seven-figure-research-funding/ Machine Learning will make video conferences more reliable Andreas Granig, Daniel Tiefnig, Markus Seidl | © Carolin Bohn The two founders Andreas Granig and Daniel Tiefnig are doing it again. After selling their company Sipwise to Alcatel-Lucent Enterprise for an eight-figures amount in 2018, they are back together for another startup adventure. With Markus Seidl as the third shareholder, their new startup Sipfront is off to revolutionize test automation for telecom services. https://sipfront.com/blog/2022/05/sipfront-secures-six-figure-angel-funding-for-its-launch/ Tue, 03 May 2022 10:15:00 +0200 https://sipfront.com/blog/2022/05/sipfront-secures-six-figure-angel-funding-for-its-launch/ How the telecom experts revolutionize the industry with a new test automation solution Daniel Tiefnig, Andreas Granig, Markus Seidl | © Carolin Bohn For over a year, Andreas Granig has been busy preparing to reshape the communications business again with his new startup Sipfront. With their six-figures investment, Daniel Tiefnig and Markus Seidl are now joining as partners. Daniel and Andreas already sold their co-founded telecom equipment supplier Sipwise to Alcatel-Lucent Enterprise for an eight-figures amount in 2018, and they are off to repeat their high-tech success story. https://sipfront.com/blog/2021/06/sipfront-heart-hepic/ Thu, 10 Jun 2021 10:35:00 +0200 https://sipfront.com/blog/2021/06/sipfront-heart-hepic/ If your automated test runs pass, all is good. But what if they fail, and even more so, if they fail sporadically and non-reproducibly? A case for monitoring and observability platforms Passive monitoring solutions are great tools for Telco operators to retrospectively troubleshoot call scenarios. If a particular customer raises a ticket about failed calls, you can quickly and easily drill down into the call flows, bits and bytes of the involved SIP messages, to uncover the reason for the issues. https://sipfront.com/blog/2021/04/stir-shaken-authorization/ Fri, 09 Apr 2021 20:55:00 +0200 https://sipfront.com/blog/2021/04/stir-shaken-authorization/ Robocalling, or the automated generation of calls - combined with spoofed caller ids (calling party numbers) - is illegal in most of the countries, but is still rising especially in the US. STIR (Secure Telephony Identity Revisited) and SHAKEN (Secure Handling of Asserted information using toKENs) are the standardized frameworks to fight these illegally spoofed calls. Sipfront supports this initiative by contributing an implementation to support STIR/SHAKEN in SIPp, the widely popular VoIP tester. https://sipfront.com/blog/2021/04/traffic-generation-agents-in-your-own-local-environment/ Wed, 07 Apr 2021 19:30:00 +0200 https://sipfront.com/blog/2021/04/traffic-generation-agents-in-your-own-local-environment/ The vast majority of Telco Systems under Test (SuT) are located in private networks or behind firewalls. The reason for that is that a big part of testing takes place in development environments (which often reside directly on developers’ computers), in confined lab environments, or within Continuous Integration workflows. Production systems on the other hand are usually protected by firewalls and ACLs and only allow traffic from and to certain IP address ranges. https://sipfront.com/blog/2021/01/remote-controlling-sipp/ Fri, 29 Jan 2021 00:18:00 +0100 https://sipfront.com/blog/2021/01/remote-controlling-sipp/ A lot of engineers working in the Telco industry, and particularly those with an affinity towards open source, know about sipp, the performance testing tool for the SIP protocol. Many of those engineers know the default key mappings of the console based interface by heart. Increase the call rate by one with + or by ten with *, quit with q etc. What many people don’t know though is that you can also remote control a sipp instance via UDP sockets. https://sipfront.com/blog/2021/01/client-side-kamailio/ Thu, 14 Jan 2021 21:34:00 +0100 https://sipfront.com/blog/2021/01/client-side-kamailio/ At Sipfront, we implement a product to provide SIP performance testing as a service. The core element of every performance benchmarking is an agent on the client side generating the traffic, which in our case is sipp, while at the same time, Kamailio is a well known SIP proxy typically used on the server side. In this post, I’ll show how and why the two are nonetheless fitting together in tandem. https://sipfront.com/blog/2020/11/sipfront-heart-sipvicious-pro/ Fri, 27 Nov 2020 12:33:00 +0100 https://sipfront.com/blog/2020/11/sipfront-heart-sipvicious-pro/ VoIP testing involves different angles, most importantly performance tests, functional tests, but also security tests. Now there is something in for the launch of Sipfront: Sipfront teams up with Enable Security to offer SIPVicious Pro scenarios! If you expose a VoIP system to the public internet, you might notice within a couple of minutes certain strange SIP traffic patterns trickling in. The advanced SIP engineer will immediately know what’s up: SIPVicious, also known as friendly-scanner, has found your box and is trying to find a hole in our system by checking for weak passwords. https://sipfront.com/blog/2020/11/the-technology-stack-behind-sipfront/ Tue, 24 Nov 2020 12:32:37 +0100 https://sipfront.com/blog/2020/11/the-technology-stack-behind-sipfront/ Since several people have asked me about the technology behind Sipfront, I’d like to shed some light behind the scenes on the tech stack currently used to drive the service. Sipfront is currently a one man show, therefore it’s important to keep everything as simple as possible. I tried to balance the technology stack in a way to finally use new stuff I wanted to play with since a long time while still being able to move very quickly. https://sipfront.com/blog/2020/11/why-sipfront/ Mon, 23 Nov 2020 15:45:37 +0100 https://sipfront.com/blog/2020/11/why-sipfront/ The mission of Sipfront is simple: to make VoIP testing accessible. Why? Because I personally would like to provide a service that is meeting the following criterias, which I didn’t find anywhere else: What You See Is What You Get When somebody stumbles upon Sipfront while searching for VoIP testing tools, I would like them to quickly get an idea of what we’re providing here. Screenshots, Videos, and most importantly a subscription tier with free credits to try it.