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One-way audio issue with PJSIP: assincronous codecs
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mbello Offline
Junior Member

Posts: 14
Joined: Jan 2015
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Post: #1
One-way audio issue with PJSIP: assincronous codecs
Hi, following this discussion on FreePBX forums:

It appears that Yealink phones are the culprit.

I captured pcap files that I believe will help understand the problem. The pcap is for a call from a Yealink T46g phone to an asterisk 13.5 box, the call is to the Echo service (*43).

The call should go like this:
- First, Asterisk plays a message that explains how the echo service works. This message lasts for about 25 seconds;
- Then the echo test begins and everything I say is echoed back to me.

Looking at the pcap, it happened like this:
- Asterisk on SDP offered codecs ALAW and G722;
- Yealink T46G offered G722 and ALAW;
- Asterisk started sendng G711 but then 1 second after, it switched to G722 to play the message. I could not hear anything that was played, the phone was silent;
- During this time while asterisk was sending audio in G722 format, the T46g phone was sending back in G711 format;
- After the initial announcement played, Asterisk went back to sending audio in codec G711 and I then could here the echo test.

Other notes:
- If on Asterisk I make G722 the first option than everything works fine.;
- With exactly the same codec priority as set on the T46g, my Bria Android client worked just fine and I could hear the announcement;
- However, grandstream phones also suffered the same problem, I could not hear the announcement from echo test.

Could Yealink please investigate this issue?

Attached File(s)
.pcap  g722.pcap (Size: 640.25 KB / Downloads: 7)
(This post was last modified: 11-04-2016 03:01 AM by mbello.)
09-22-2015 11:57 AM
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Messages In This Thread
One-way audio issue with PJSIP: assincronous codecs - mbello - 09-22-2015 11:57 AM
RE: Bug involving codec G722 - 1sae - 07-27-2016, 06:14 AM
RE: Bug involving codec G722 - amessina - 09-06-2016, 02:57 AM
RE: Bug involving codec G722 - amessina - 09-12-2016, 03:15 AM
RE: Bug involving codec G722 - mbello - 10-04-2016, 06:40 AM
RE: Bug involving codec G722 - mbello - 11-04-2016, 02:58 AM

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