[Asterisk-Users] Re: no ring on inbound SIP calls

[Rich Adamson]

> > > On incoming SIP calls, the caller just gets silence instead of ringing
> > > until *  answers the channel.   Is this a configuration issue on my
> > > end?
> > >
> > > Chris
> > >
> > Correction, this is true for both IAX and SIP incoming calls on my
> > system.  I have IAX setup with teliax and SIP with livevoip.
> > 
> 
> Hmm, I did not realize that the Ringing command can be used before the
> call is answered, I thought it could only be used after it was
> answered.  Putting the Ringing command at the top of the extension
> fixed my problem.

I don't believe an iax -> sip call is considered answered until the
sip phone picks up. Therefore, the "r" option instructs asterisk to
provide ringback tone until the sip does answer. (That's not necessarily
true with some other channels though.)