[Freeswitch-users] codec negotiation error

[Brian West]

Sounds like you need to setup outbound caller ID, do you have a full sip
trace?

On Mon, Aug 8, 2022 at 9:22 PM Brian May <brian at linuxpenguins.xyz> wrote:

> OK, so some facts:
>
> * Similar problems for 2 providers.
> * If incoming call is bridged, it fails.
> * If incoming call is redirected to 9196 echo test it works.
> * The call to 9196 is answered immediately. But the time take to answer
>   the call does not appear to be significant.
>
> I created tcpdumps of both cases.
>
> * In both cases, simple INVITE, TRYING, OK, ACK sequence.
> * In the good case, the provider starts sending data immediately after the
> ACK.
>
> My reasoning is:
>
> * The server must be doing something different in order for the
>   behaviour to change of the packets it is sending.
>
> * This means the server must know which case is being tested.
>
> * This follows that we must be communicating something different to the
>   server, depending on which case is being tested.
>
> I have opened two instances of wireshark, and comparing the two traces,
> I see only insignificant differences:
>
> * port numbers are different.
>
> * In the not-working case we send a Session Progress message while the
>   phone is ringing, I think this is just a consequence of taking more
>   time to answer the call.
>
> * In the working case, in the OK message freeswitch sends a "Accept:
> application/sdp" header.
>   In the non-working case we omit the header.
>   I find it hard to believe this could be of any consequence.
>
> All other details, codecs, IP address details, etc are identical.
>
>
> Oh, almost missed a difference; we send to the provider in the OK
> message (bad vs good calls):
>
> -P-Asserted-Identity: "Outbound Call" <sip:1005 at sip.crazytel.net.au>
> +P-Asserted-Identity: "61390369013" <sip:61390369013 at sip.crazytel.net.au>
>
> What is this header? Could the fact I am sending the wrong value be
> significant? My provider doesn't know anything about my 1005 extension.
>
> I am somewhat doubtful actually.
>
> --
> Brian May <brian at linuxpenguins.xyz>
> https://linuxpenguins.xyz/brian/
>


-- 

Brian West | Co-founder and Developer

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