Summary:ASTERISK-12707: Need to remove "silenceSupp" parameter from SDP
Reporter:sujit (sujit)Labels:
Date Opened:2008-09-10 05:40:03Date Closed:2011-06-07 14:08:20
Versions:Frequency of
Environment:Attachments:( 0) CallLog-500-InternalError.txt
( 1) extensions.conf
( 2) sip.conf
Description:Hi There,

After successful registration of the the  SIP server,
while trying to make outgoing call Server is sending  "500 Server Internal
Error" as a response of the INVITE. The reason is in the SDP of INVITE, asterisk is sending "a=silenceSupp:off - - - -".

  While incoming call to the nunber, as soon as we off-hook , call is getting
disconnected. As SDP of 200 OK also contains  "a=silenceSupp:off - - - -",
server is responding with BYE.

  We are sure about this reason. Because previously for other vendor we faced
same problem. We disable the VAD feature and we were able to make incoming and
outgoing call. In that case the attribute "a=silenceSupp:off - - - -" is NOT
present in SDP.

 So we need some configuration by which we can make completely remove this
attribute line from SDP.

  Please advise how to resolve this issue.

Thanks !
~Sujit Das
Comments:By: Leif Madsen (lmadsen) 2008-09-10 08:30:17

You will need to reproduce this issue on 1.4.x as only security issues are resolved in 1.2.x since it is now in End-of-Life mode.

By: Joshua C. Colp (jcolp) 2008-12-10 09:03:51.000-0600

If you would like to submit a patch to make this an option I would be fine with this, but your situation is the only time I have ever heard of the attribute needing to be removed so I am suspending this as a feature request with no patch.