[asterisk-users] D channel signalling, while B channels busy?

[Armin Schindler]

On Wed, 16 Jul 2008, Stefan-Michael Guenther wrote:
> Hi,
>
> I'm running a number of asterisk installations with EICON/DIALOGIC and
> AVM cards, together with different versions of chan_capi.
>
> All installations share a strange phenomenon:
>
> Although all B channels are busy, another incoming call to a free phone
> lets this phone ring. When I pickup up the phone, the caller suddenly
> hears the busy tone and I hear nothing.
>
> Could it be, that the D channel is forwarding a call, although it could
> never be accepted? Is there a way to change this behaviour because to me
> it doesn't make sense and it is rather annoying experience for the caller.

This is a feature of your line: call-waiting.
chan-capi signals this call with a special setting in variable
BCHANNELINFO (see README) and you can decide what to do (reject, deflect,
...)

Armin