[Asterisk-Users] 180 Ringing? (BUG?)

[Julian J. M.]

I guess that's "Early Media Connect", i.e., if the phone supports that
(not all do), the channels get bridged just after dial completed, (SIP
183), and what you hear is the remote ring tones (from your telco),
not locally generated (as if it received SIP 180 Ringing).

What IP phones are you using? You may try xlite and check if you hear
ringing tones.

Julian.

On 6/9/05, Mirko Marghitola <marg at ticino.com> wrote:
> Voilà.
> Now i know where is the problem.
> I use 2 ISDN channels with a with a fritz! card and the junghanns capi
> drivers.
> The problem appears with SIP to ISDN calls.
> 
> The SIP 180 ringing message doesn't appear because the ISDN PBX sends
> the "ALERT" message in-band (channel B), and not in the D channel. So
> Asterisk doesn't know when the ISDN channel is ringing.
> With my configuration Asterisk can not understand the in-band signalling
> for the capi channels, is it possible to use "in-band" signallisation
> for capi channels?
> 
> Mirko