[asterisk-users] Incoming INVITE with Portability Info and LRN

[Trey Hilyard]

I am trying to set up my Asterisk server so that it will recognize an
incoming call to the Asterisk's own Location Routing Number (LRN),
validating the "rn" in the INVITE and then using the Called Number from the
INVITE as the extension in the dialplan.

The INVITE R-URI looks like:
INVITE sip:+19135041291;rn=+19136630000;npdi at 12.4.240.200:5060;user=phone;transport=udp
SIP/2.0

The +1913663000 is the LRN of the Asterisk box, so I would want to have the
dialplan validate that the "rn" is that number. The +19136631291 is the
extension within the system that they are trying to reach, that extension
will vary, and will have an exten defined in the dialplan.

I assume that this is just going to require that I do some matching and
substring-type variable replacement to hit a context with just the Called
Number part of the request, but I wondered if anyone had a working example
of this before I started putting too much effort into it.

As a PBX, Asterisk doesn't have to worry about portability, but I am using
it to simulate a full-blown Class 5 switch, so I have to have an LRN
assigned to it to allow users to port to that switch.

-Trey
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