[asterisk-dev] sip message 183 and ringback

[dima]

Thanks for your reply.
In my case I'm getting a "100 Trying" message followed by "183 Session
in progress". Also I see that the phone exchanges some rdp traffic with
asterisk. However I can't hear the ringback (just silence until the
other side picks up the phone). Does ringback depend on what I'm getting
on an rdp port? Could that be that the sip messaging is correct, but the
other side sends "silence" instead of "ringback".

> 183 means that early media is available. Thus, the party who sent the 
> 183 should also send media (e.g. ringback or busy tones).
> 
> If a client sends 180 Ringing only, the ringback will be produced by the 
> caller.
> 
> regards
> klaus
> 
> dima wrote:
> > Hello everyone.
> > Please, could anyone explaing, if a 183 "Session in progress" message is
> > the only thing needed for generating ringback? Another question is where
> > do those ringbacks come from (who generates them?).
> > I'm having a wierd problem of not having ringback when dialing some
> > particular numbers (asterisk 1.2.18).
> > Thanks in advance
> > 
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