[Freeswitch-users] Late SDP causing switch to sendonly mode - one way calls (3PCC?)

[Mike Jerris]

> On May 24, 2019, at 8:54 AM, Callum Guy <callum.guy at x-on.co.uk> wrote:
> 
> Hi All,
> 
> In short I have an established bridged call out to a 3rd party SIP IVR - this IVR appears to be performing 3pcc meaning I am receiving RE-INVITEs w/o SDP as the call plays prompts, goes to queue and when it is answered. For each INVITE FreeSWITCH responds with 200 with SDP and we get an ACK back with SDP. During the queue phase the ACK SDP contains a=sendonly - all previous SDP have implied sendrecv on both sides. All is OK at this stage. When the call is finally answered we get an INVITE w/o SDP and FreeSWITCH responds with SDP including a=sendonly, to which the remote replies a=sendrecv. Hence we get one way audio at the time when the conversation should be starting.
> 
> Can anyone help explain why FreeSWITCH would be switching to sendonly mode? I have enable_3pcc=true configured but otherwise this is a fairly standard/vanilla configuration. The behaviour I would expect is for FreeSWITCH to continue to omit the attribute and imply sendrecv. 
> 

"During the queue phase the ACK SDP contains a=sendonly”

Freeswitch is NOT switching it.. the other side is.


> Are there specific variables which might allow me to manage the SDP attributes?
> 
> Please find a trace log attached. 
> 
> Platform:
> FreeSWITCH Version 1.8.5-6-31281a0bf1~64bit (-6-31281a0bf1 64bit)
> Linux my.network 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) x86_64 GNU/Linux
> 
> Let me know if I can offer any more details regarding the implementation, thanks,
> 
> Callum
> 
> 
> 
> 
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> <sdp-sendonly.log>_________________________________________________________________________
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