[Bristuff-users] Snom Patch unaswered calls / "Call completed elsewhere"

[Philipp Walker]

Hi all,

This is not really a BRI(stuff)-thing, but in my opinion, it fits in very well 
into BRIstuff's other Asterisk-Patches that enhance Interoperability between 
(bristuffed) Asterisk and snom phones:
The attached small patch modifies Asterisk to send SIP CANCEL Messages with 
 Reason: SIP ;cause=200 ;text="Call completed elsewhere"
if someone "in" the same Dial command answered the call (according to RFC 
3326, section 3.1). This signals snom phones not to show an unanswered call 
on phones that received that CANCEL message. See also snom KB 
http://kb.snom.com/kb/index.php?View=entry&CategoryID=17&EntryID=75
Maybe other phones implement this, too.
Patches for this have been around for quite a while, but some of them where 
not really coded properly, IMHO.
So I sat down and tried to implement it in a proper way for the (pre-)latest 
BRIstuff (Junghanns) version bristuff-0.4.0-RC3b (Asterisk 1.4.21.1).
Just apply it to Bristuff's asterisk folder after all patches have been 
applied and make / make install asterisk.
Only briefly tested, so no warranties...

Maybe someone out there finds this patch useful, I guess it'll never make its 
way into the official Bristuff dist anyway....

-- 
Philipp Walker
Binatec AG
Ingenieurbüro für Nachrichten- und Informationstechnik
Q4 Altdorf Ost
Hellgasse 23 / Postfach
6460 Altdorf

philipp.walker at binatec.ch
www.binatec.ch
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