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Summary:ASTERISK-11958: Changing of RTP SSRC between early-session and actual call session
Reporter:Francesco Castellano (fcastellano)Labels:
Date Opened:2008-05-02 05:52:41Date Closed:2011-06-07 14:08:17
Priority:MinorRegression?No
Status:Closed/CompleteComponents:Core/RTP
Versions:Frequency of
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Description:Upgrading Asterisk from 1.4.17 to 1.4.19 I noticed some SIP clients (for example Siemens Gigaset C450IP), experienced a silence period (4/5 secs) after the remote party (on PSTN) answered. Looking at the RTP packets, I concluded this is relate to the change of SSRC between the early session established with 183 Session Progress, and the actual call session following the 200 Ok message.

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This seems to be related to issue 0012353, because a similar silence associated to the change of SSRC happens during trasmissions of DTMF. Nonetheless, I cannot understand if such a change is "correct" (standard-compliant) or not. Moreover I was wondering if the removing

rtp->ssrc = ast_random();

from ast_rtp_new_source function is a viable solution, even if it is not being included in the release 1.4.19.1
Comments:By: Joshua C. Colp (jcolp) 2008-05-05 09:04:17

This has already been changed.