[Freeswitch-users] Codec renegotiation on Re-INVITE withot SDP

Станислав Запольский stszap at gmail.com
Tue Apr 12 12:47:49 MSD 2016

Anyone? I will try to describe my problem once more. I have default FS
install. I enabled "renegotiate-codec-on-hold",
"renegotiate-codec-on-reinvite" and "enable-3pcc" in internal profile. My
dialplan is:

  <context name="default">

    <extension name="echo">
      <condition field="destination_number" expression="^.*$">
        <action application="answer"/>
        <action application="echo"/>


I use the following sipp scenario https://pastebin.freeswitch.org/24629
with the following command:
sipp <ip>:<port>  -sf sipp_scenario.xml -m 1

And getting the following siptrace https://pastebin.freeswitch.org/24630

My question is: Is it possible to setup FS in such a way, that in the
second "200 OK" it would send "a=sendrecv" instead of "a=recvonly"?


On Wed, Apr 6, 2016 at 6:16 PM, Станислав Запольский <stszap at gmail.com>

> Hello. We are facing the following problem with our FS setup:
> 1. provider sends us INVITE with "a=sendonly" in SDP
> 2. FS picks up the call, playing ivr and replying with 200 and
> "a=recvonly" in SDP
> 3. provider sends Re-INVITE without SDP
> 4. FS replying 200 with already negotiated SDP (single codec and
> "a=recvonly")
> Provider wants renegotiation of sdp on step 4, or a least "a=sendrecv"
> parameter. Is there a way to achieve this without source modification? We
> tried setting following profile parameters:
> renegotiate-codec-on-hold=true
> renegotiate-codec-on-reinvite=true
> enable-3pcc=true
> but no luck. The only solution we found was modifing sofia.c like this:
> line 7374 - replace switch_core_media_gen_local_sdp(session,
> switch_core_media_gen_local_sdp(session, SDP_TYPE_RESPONSE, NULL, 0,
> "sendrecv", 0);
> line 7376 - replace nua_respond(tech_pvt->nh, SIP_200_OK, TAG_END()); with
> nua_respond(tech_pvt->nh, SIP_200_OK,
> SOATAG_USER_SDP_STR(tech_pvt->mparams.local_sdp_str), TAG_END());
> Thanks.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20160412/35669b97/attachment.html 

Join us at ClueCon 2016 Aug 8-12, 2016
More information about the FreeSWITCH-users mailing list