[asterisk-bugs] [JIRA] (ASTERISK-25414) CLONE - [patch] IMS TEL URI incoming INVITE RFC 3966 not recognized

[Alexander Gonchiy (JIRA)]

Alexander Gonchiy created ASTERISK-25414:
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             Summary: CLONE - [patch] IMS TEL URI incoming INVITE RFC 3966 not recognized
                 Key: ASTERISK-25414
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-25414
             Project: Asterisk
          Issue Type: Improvement
          Components: Channels/chan_sip/Interoperability
    Affects Versions: 11.5.1, 12.0.0
         Environment: All platforms
            Reporter: Alexander Gonchiy


This problem exists in ALL versions of Asterisk.

Asterisk seems *not* to support RFC 3966 TEL URI for INCOMING INVITEs. X-Lite and other clients like Bria are compliant with RFC 3966.

When an IMS server sends an incoming TEL URI INVITE I get the following errors, and the incoming call is disconnected (number busy).

Here you find part of an (incoming) INVITE request and sip debug output:

From: <*tel:0987654321;phone-context=+32987654321*>;tag=tag-etc
CSeq: 1 INVITE
P-Asserted-Identity: <tel:0987654321>
P-Called-Party-ID: <sip:+3212345678 at ...>
Diversion: <sip:+3212345678 at ...;user=phone>;reason="extension";privacy="off";counter=1

Using INVITE request as basis request -
Nov 13 17:52:05 NOTICE[27459]: chan_sip.c:6973 check_user_full: *From address missing 'sip:', using it anyway*

Nov 13 17:52:05 WARNING[27459]: chan_sip.c:6525 get_destination: Huh? Not a SIP header (*tel:0987654321;phone-context=+32987654321*)?

RDNIS is +3212345678
SIP/2.0 404 Not Found

Actually I found out that Asterisk is indeed not conform to the RFC 3966 standard.

I have solved the problem by patching chan_sip.c and reqresp_parser.c -- see patch in code attachments.


I have changed the following functions:

* check_user_full
* get_destination
* parse_uri OR parse_uri_full (depending on the Asterisk version)

When ;phone-context= is provided in the incoming tel:uri then we can extract the calling number for further call handling.

Now IMS and Asterisk are talking to each other without problems.

More information:

http://forums.digium.com/viewtopic.php?f=1&t=76432&sid=6d53062361c22079757c53ccc73d3132



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