Back to Blog
Tech

SIP Messages of the Call

Published on:

May 22, 2013

SIP's human-readable format, unlike H.323, allows easier understanding of the communication between clients and servers, though not everyone can interpret the details without understanding the specific RFCs. This clarity helps when troubleshooting issues, especially when reviewing SIP logs. In multi-domain environments, however, finding relevant messages can be challenging, especially when filtering by IP only works at the system level. The upcoming version 5.0.11 will address this by allowing domain administrators to access SIP logs, making it easier to diagnose issues in isolated environments independent of other system traffic. This update promises significant improvements.

Christian Stredicke

In contrast to other protocols like H.323, SIP is a "human readable" format just like HTTP or SMTP. Some people say this was the reason why SIP was more successful than H.323.

But human readable doesn't mean it can be read by all humans, especially those who didn't have the time to flip through the pages of RFC3261, RFC3262, RFC3263 and so on - and they would have had a hard time to understand what exactly is going on between the client and the server. On a side note, http://rfc3261.net is still one of the "favorite" web pages when it comes to understanding SIP.

Reading the SIP messages helps a lot to troubleshoot the problems with the many SIP service providers out there. Even if the reader understands only a fraction of the content, it's already helping. Not to mention that the people supporting snom ONE get access to traces that tell a lot about potential problems.

In the multi-domain environment, SIP logs are even more difficult to read. Especially on busy systems, finding the right messages is like searching for a needle in a hay stack. Filtering by IP address was a workaround, but it only works only at system level, which leaves the domain administrators without a workable solution.

We already collected the call-related SIP packages in the call. For example, when the PBX detected one-way audio, it would append the messages in the email that reports this event.

In the next version we will also include messages on the domain level. This will make it possible that domain administrators can look at the SIP packets. And it will make it easier to look at problems in the isolated environments independently from other traffic on the PBX.

5.0.11 will be the best we ever had.

Latest Articles

View All
Editorial

Keep Talking: AI and the Future of Business Communication

From the moment humans learned to speak, communication has shaped how we live, work, and connect. Today, voice remains one of the most natural and information-rich forms of human interaction, even as business communication expands across chat, video, messaging, and digital platforms. As AI becomes more deeply integrated into phone systems and contact centers, voice may play an increasingly important role in how intelligent systems understand context, respond to people, and support real-time communication.

September 9, 2026
Editorial

How MSPs Can Build Recurring Revenue by White-Labeling the Vodia PBX

White-labeling the Vodia PBX enables MSPs and VARs to offer business communications under their own brand without developing and maintaining the underlying PBX technology. Providers control branding, packaging, pricing, service delivery, and customer relationships, while Vodia supplies the multi-tenant platform. With V70’s expanded branding and management tools, MSPs can get to market faster and create new recurring-revenue opportunities.

September 3, 2026
Announcement

CarPlay Now Available with the New Vodia iOS App

Apple CarPlay support is now available with the Vodia iOS app, bringing essential PBX communication features to the vehicle display through Apple’s native in-car interface. Users can access recent calls, browse the extension directory, view colleague presence, listen to voicemail, use Siri for calls and PBX messages, and receive communication alerts, while built-in readiness checks and automatic recovery help maintain reliable access when network conditions change. The experience supports compatible wired and wireless CarPlay systems.

September 1, 2026