[Freeswitch-users] Port changes in multiple 183s cause no audio after 200

[Steven Ayre]

This sounds like it belongs on Jira so the issue can be tracked.

On 27 January 2015 at 00:04, Jeff Pyle <jpyle at fidelityvoice.com> wrote:

> Hello,
>
> The following is on FreeSWITCH Version
> 1.5.15b+git~20150126T215733Z~c16f9ec1d9~64bit (git c16f9ec 2015-01-26
> 21:57:33Z 64bit).
>
> The design goal for this configuration is that of a simple transcoding
> SBC.  SIP calls arrive with various supported codecs, SIP calls bridge out
> on PCMU.  No users, no auth, etc.  Overall, it seems to work but there is
> one call flow I'm struggling with.
>
> The B-leg of calls are bridged to a PSTN gateway.  If the gateway's
> signaling follows 100, 183, 200, all is well.  But if the gateway sends
> multiple 183s with different RTP ports, there is no audio when the call
> goes to 200.  See the following example:
>
>  - Gateway signals 183 with SDP indicating audio on port 16384.
>  - Gateway signals 183 with SDP indicating audio on port 16386.
>  - Gateway signals 200 with SDP indicating audio on port 16384 (same as
> original 183).
>
> In the debug I see where it detects the port change from 183 #1 to 183
> #2.  As such, I hear early media from both until the 200 OK.  When the call
> connects, I see no such port change in the debug, and since it's still
> listening on the wrong port (from 183 #2), there is no audio.
>
> I've seen some older posts where Anthony seemed against even the port
> change from 183 #1 to 183 #2, yet that seems to work okay today.  It just
> doesn't sense the port change from 183 --> 200.  I don't know if this is a
> feature, bug, or misconfigured option.  Thoughts are welcome!
>
>
> - Jeff
>
>
>
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