[Asterisk-Dev] ringback after PlayBack()

[Guo-Wei Chiuan]

Hi Keivn,

I see. That means after "183 Session Progress", it is the PBX's job to
indicate future progress for current session, for example, PBX can play MOH
to endpoint.... Meanwhile, PBX shall not send "180 Ringing" after 183 to let
endpoint generate ringback tone, and endpoints usually would ignore 180
after 183 as well.

-Jerry


On 1/19/06, Kevin P. Fleming <kpfleming at digium.com> wrote:
>
> Guo-Wei Chiuan wrote:
>
> > My goal is to indicate RINGING upon a caller channel in RING state by
> using
> > "180 Ringing" after 183 is ent.
> > However, according to source codes, after 183 is sent(in my case, due to
> > Playback() is done), Asterisk would not send "180 Ringing". That is what
> I
> > am trying to figure out.....
> >
> > Maybe I shall look up RFC3960. Any ideas?
>
> Once '183 Session Progress' is sent, it is not useful to send '180
> Ringing' any longer... the 183 message informs the endpoint that future
> progress indications for this session will be provided inband via the
> audio stream. Most (if not all) SIP endpoints would ignore any 180
> received after a 183 anyway.
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