[Kamailio-Users] What is wrong with this NOTIFY packet

Alex Hermann alex at speakup.nl
Mon Feb 15 09:58:49 CET 2010


On Monday 15 February 2010 09:25:41 Asterisk User wrote:
> Now to implement MWI i send NOTIFY packet from Asterisk to Kamailio and
>  from kamailio to SIP extension (Grandstream GXP2000).
> here is the packet that travels from kamailio to extension and the response
> sent from extension to kamilio.
> ===========================
> NOTIFY sip:1111111 at arzoo.com <sip%3A1111111 at arzoo.com> SIP/2.0
> Max-Forwards: 10
> Record-Route: <sip:172.18.100.74;lr;nat=yes>
> Via: SIP/2.0/UDP 172.18.100.74;branch=z9hG4bK3c3.e1003f03.0
> Via: SIP/2.0/UDP 127.0.0.1:45382
> ;received=172.18.100.73;branch=z9hG4bK.4f83530d;rport=45382;alias
> Via: SIP/2.0/UDP 172.18.100.73:5060
> From: <sip:111 at arzoo.com <sip%3A111 at arzoo.com>>
> To: <sip:1111111 at arzoo.com <sip%3A1111111 at arzoo.com>>

NOTIFY's are in-dialog requests. Your From and To header are missing the 
required tags (and look a bit suspicious by themselves too because of the 
double <>). The grandstream probably can't match the NOTIFY to the correct 
subscription and follows a code path that for some reason decides to answer 
415 instead of a 481.

Alex.
-- 
Alex Hermann



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