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Jitter buffer problem with yealink T-21P
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cabijuan Offline
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Post: #1
Jitter buffer problem with yealink T-21P
Hi, I'm having trouble with a jitter buffer yealink T-21 with the latest firmware. 34.72.0.75.

Using the same Internet channel, the same settings and the same SIP account has a Yealink T-20

The Yealink T-20 works without audio clips and T-21P has audio clips.

I modified the parameters of Jitter Buffer of T-21, but still have the same problems.

You can help me, I have .pcap

Thank you very much.
06-01-2015 11:18 PM
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James_Yealink Offline
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Post: #2
RE: Jitter buffer problem with yealink T-21P
Hi,

How many T21 in your side? All of them have this problem? Have you tried resetting phone?
Please attach pcap and phone config.bin file in this post.(You need to compress them before adding)

Regards,
James
06-02-2015 04:02 AM
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cabijuan Offline
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RE: Jitter buffer problem with yealink T-21P
Hello, I attached screenshots privately.

I've attached a screenshot on the phone Yealink T20 and its configuration (all hear perfect).

Also I attached a screenshot of yealink T21P made on the phone where evil and hear the same call also you shoot my proxy sip which is as it sounds perfect.

Obviously all for the same Internet

I sent catches support@yealink.com because I can not attach a private message and function Yealink_James Send an email not working.

Thank you.
(This post was last modified: 06-02-2015 05:34 PM by cabijuan.)
06-02-2015 05:23 PM
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cabijuan Offline
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RE: Jitter buffer problem with yealink T-21P
Hello,

Yesterday catches send support@yealink.com I wonder what state the incidence is. Thank you.
06-03-2015 05:42 PM
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James_Yealink Offline
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Post: #5
RE: Jitter buffer problem with yealink T-21P
Hi, I have received your files.
Will check it and reply you in several days.

Regards,
James
06-04-2015 06:17 AM
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cabijuan Offline
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Post: #6
RE: Jitter buffer problem with yealink T-21P
I welcome your comments. Thank you.
06-04-2015 07:25 PM
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cabijuan Offline
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Post: #7
RE: Jitter buffer problem with yealink T-21P
Hello, I would like to know the status of the incidence.

Thanks
(This post was last modified: 06-15-2015 07:37 PM by cabijuan.)
06-15-2015 07:37 PM
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James_Yealink Offline
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RE: Jitter buffer problem with yealink T-21P
Hi,

From the pcap trace, the two phones use a same codec and experience a same drop by jitter butter.
I have sent the file to R&D for a deep analysis. Any update will let you know.

May I know the audio clips occur in every call or some specific call?

Thanks,
James
(This post was last modified: 06-20-2015 06:36 AM by James_Yealink.)
06-20-2015 06:36 AM
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cabijuan Offline
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Post: #9
RE: Jitter buffer problem with yealink T-21P
It occurs on all calls
06-20-2015 06:44 AM
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James_Yealink Offline
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Post: #10
RE: Jitter buffer problem with yealink T-21P
Hi,

R&D give a conclusion.
1. The RTP packet is lost in pbx server. From pcap trace, there are some RTP packet lost when pbx server transmit them which cause the problem.
2. The jitter butter in T21 don't work correctly as T20.

Can you firstly check why the RTP packet is lost?

Thanks,
James
06-24-2015 02:39 PM
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