[asterisk-users] Extensions of sip trunk

[Hans-Peter Jansen]

Hi Daniel,

On Montag, 5. Juni 2017 21:45:01 Daniel Tryba wrote:
> On Mon, Jun 05, 2017 at 06:10:50PM +0200, Hans-Peter Jansen wrote:
> > ; matches 12345678099, too
> > exten => _1234567800,1,Dial(SIP/int)
> > 
> > Except from SIP invite with tcpdump:
> > 
> > INVITE sip:123456780000 at provider:5060 SIP/2.0
> > From: <sip:013579246800 at provider>;tag=as6bc7cbbc
> > To: <sip:1234567800099 at other:5060>
> 
> 12345678099 doesn't match _1234567800. The problem is the other side is
> setting the R-URI to sip:123456780000 at provider for any number, so the
> EXTEN matched in the dialplan is 123456780000. Ask them to fix this
> problem.

Will do.

> > I wonder, if I really need to grab the extension with
> > Set(DN=${SIP_HEADER(TO):5}) or something similar?
> 
> Yes, something like if they can't fix the R-URI:
> exten => X_.,n,Set(TO=${CUT(SIP_HEADER(To),@,1)})
> exten => X_.,n,Set(TO=${CUT(TO,:,2)})
> exten => X_.,n,Goto(somewhereelsetopreventloops${TO},1)

Sorry for the silly question, but how do I feed the TO variable back to the 
usual pattern matching? Assign to $EXTEN?

> > Another issue is, that I don't like asterisk to decline foreign INVITE
> > requests. Any best practices from within asterisk on how to ignore SIP
> > invitations, that don't match certain criteria (neither local nor from sip
> > provider)?
> 
> Don't enable guest access, or send any unknown/guest to a context that
> will just hangup.

Hmm, tried allowguest=no in general sip.conf section, but this results in 
asterisk responding with <SIP/2.0 401 Unauthorized> on INVITE from provider, 
and (valid) calls get blocked.

Thanks,
Pete