[asterisk-users] SIP detects loop when forwarding to voicemail

[Tomasz Zieleniewski]

Thank you!

It would be greate to have these feature set as a parameter in sip.conf

cheers
tomasz

On Nov 28, 2007 2:38 PM, Philipp Kempgen <philipp.kempgen at amooma.de> wrote:

> Tomasz Zieleniewski wrote:
> > How does asterisk detect the loop.
> > What are the criteria here.
> > What do I need to change in the SIP message so
> > that asterisk will not consider it looped??
>
> > On Nov 23, 2007 4:03 PM, Tomasz Zieleniewski <tzieleniewski at gmail.com>
> > wrote:
> >
> >> hi,
> >>
> >> I use asterisk as a gateway which forwards external calls from pstn to
> >> my internal sip network.
> >> all sip signaling is passed to sip proxy.
> >> I also use asterisk as a voicemail server.
> >> everything works well when calls are passed to asterisk from local
> >> network.
> >> but when calls are forwarded from asterisk to sip proxy and then sip
> >> proxy decides to pass it back to asterisk
> >> waorking as a voicemail server
> >> asterisk complains about the loop and returns 482 response.
> >> Can it be somehow reconfigured??
>
> See
> http://bugs.digium.com/view.php?id=7403
> and look for this code in chan_sip.c:
> ---cut---
>        /* Check if this is a loop */
>        if (ast_test_flag(&p->flags[0], SIP_OUTGOING) && p->owner &&
> (p->owner->_state != AST_STATE_UP)) {
>                /* This is a call to ourself.  Send ourselves an error code
> and stop
>                processing immediately, as SIP really has no good mechanism
> for
>                being able to call yourself */
>                /* If pedantic is on, we need to check the tags. If they're
> different, this is
>                in fact a forked call through a SIP proxy somewhere. */
>                transmit_response(p, "482 Loop Detected", req);
>                sip_scheddestroy(p, DEFAULT_TRANS_TIMEOUT);
>                return 0;
>        }
> ---cut---
>
> There's no way to configure the loop detection but you could
> remove the code to disable loop detection.
>
> Grüße,
>  Philipp Kempgen
>
> --
> amooma GmbH - Bachstr. 126 - 56566 Neuwied - http://www.amooma.de
>    Let's use IT to solve problems and not to create new ones.
>          Asterisk? -> http://www.das-asterisk-buch.de
>
> Geschäftsführer: Stefan Wintermeyer
> Handelsregister: Neuwied B 14998
>
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20071129/1ee4d1c7/attachment.htm