[SIPForum-discussion] Question about SUBSCRIBE method processing in proxy

Tomasz Zieleniewski tzieleniewski at gmail.com
Fri Apr 17 07:36:38 UTC 2009


If the requestURI sip:user1 at kv-po-ykrapivanb.umc.com.ua
is a correct AOR for this user and proxy doesn't provide service for this
particular event package then it is completely normal behavior to send
the request further to the destination.
If proxy handles user domain then by making a query to location service
and if not then by applying standard routing procedures.

Kind regards,
- Tomasz Zieleniewski

2009/4/16 Yevgen Krapiva <ykrapiva at gmail.com>:
> Hi.
> Here is short description of incoming SUBSCRIBE request:
>>SUBSCRIBE sip:user1 at kv-po-ykrapivanb.umc.com.ua SIP/2.0
>>Via: SIP/2.0/UDP;branch=z9hG4bK-d8754z->a53f3d4a240cb301-1---d8754z-;rport=18822;received=
>>Contact: <sip:user1 at>
>>To: "user1" <sip:user1 at kv-po-ykrapivanb.umc.com.ua>
>>From: "user1" <sip:user1 at kv-po-ykrapivanb.umc.com.ua>;tag=801dfd1e
> I've found that if proxy doesn't understand such or similar methods,
> it will forward this request back to sender because of RequestURI.
> Then the sender will send reply (Event Package Not Supported) to
> proxy, and proxy again will forward response to sender.
> So, the sender is appeared to talk itself.
> Is this normal operation ?
> Thanks.
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