[Freeswitch-users] No ringback/audio suddenly

[Michael Collins]

These are on outbound calls through pennytel, correct? Find out if the 183
that they send has media or not. Most likely they're doing something silly
like sending a 183 w/media but not actually sending media. A pcap analyzed
in wireshark would help you see exactly what they are doing. Once you know
that then you can probably figure out what the next step should be.

-MC

On Mon, Mar 21, 2011 at 3:30 AM, Mark Campbell-Smith <
mcampbellsmith at gmail.com> wrote:

> Hi!
>
> I have an issue with no ringback or audio that has just started in the last
> few weeks.  No changes in FS, which has been rock solid for a long time.  I
> think my voip provider Pennytel has upgraded or changed their servers.
>
> Anyway, the difference in signalling is as follows:
>
> This does not work:
> INVITE sip:number at sip.pennytel.com SIP/2.0
> SIP/2.0 100 Trying
> SIP/2.0 401 Unauthorized
> ACK sip:number at sip.pennytel.com SIP/2.0
> INVITE sip:number at sip.pennytel.com SIP/2.0
> SIP/2.0 100 Trying
> SIP/2.0 183 Session Progress
> SIP/2.0 180 Ringing
> SIP/2.0 200 OK
> ACK sip:202.85.243.105:5061 SIP/2.0
> BYE sip:202.85.243.105:5061 SIP/2.0
> SIP/2.0 200 OK
>
> This works
> INVITE sip:number at sip.pennytel.com SIP/2.0
> SIP/2.0 100 Trying
> SIP/2.0 401 Unauthorized
> ACK sip:number at sip.pennytel.com SIP/2.0
> INVITE sip:number at sip.pennytel.com SIP/2.0
> SIP/2.0 100 Trying
> SIP/2.0 183 Session Progress
> SIP/2.0 200 OK
> ACK sip:202.85.243.105:5061 SIP/2.0
>
> And I see after the Ringing signal in the case that does not work (there is
> no ringing signal in the case that does work):
> 2011-03-21 20:28:25.677621 [DEBUG] sofia.c:4641 Channel
> sofia/external/0393011079 skipping state [proceeding][180] received after a
> RINGING
>
> Can anyone point me to a reason for the difference in signalling and what I
> can do to get audio 100% of the time?
>
> THanks
>
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