No idea?
On 05/06/11 22:31, Eugen Dedu wrote:
Hi,
ekiga.net registrar uses kamailio 1.5.3 (yes, a bit old...) and for
users who are not registered an empty NOTIFY body is returned when asked
by a SUBSCRIBE. What does this mean from SIP standard point of view, and
from kamailio point of view (are they identical?) I see in RFC3265/3.1.6.2:
.... If the resource
has no meaningful state at the time that the SUBSCRIBE message is
processed, this NOTIFY message MAY contain an empty or neutral body
but is difficult for me to interpret what it means.
Example: I ask the presence for a user xyz who registered and quit
application long time ago:
SUBSCRIBE sip:x...@ekiga.net SIP/2.0
CSeq: 1 SUBSCRIBE
Via: SIP/2.0/UDP
82.238.108.175:5060;branch=z9hG4bKdabe824f-1a8e-e011-9efc-0024d693d8e8;rport
User-Agent: Ekiga/3.3.1
From: <sip:eugen.d...@ekiga.net>;tag=4888824f-1a8e-e011-9efc-0024d693d8e8
Call-ID: f602824f-1a8e-e011-9efc-0024d693d8e8@snoopy
Supported: eventlist
To: <sip:x...@ekiga.net>
Accept: application/pidf+xml
Accept: multipart/related
Accept: application/rlmi+xml
Contact: <sip:eugen.dedu@82.238.108.175:5060>
Allow:
INVITE,ACK,OPTIONS,BYE,CANCEL,SUBSCRIBE,NOTIFY,REFER,MESSAGE,INFO,PING,PRACK
Expires: 300
Event: presence
Content-Length: 0
Max-Forwards: 70
I receive the following answer:
NOTIFY sip:eugen.dedu@82.238.108.175:5060 SIP/2.0
CSeq: 1 NOTIFY
Via: SIP/2.0/UDP 86.64.162.35;branch=z9hG4bK2a99.b8a72c47.0
User-Agent: Kamailio (1.5.3-notls (i386/linux))
From: sip:x...@ekiga.net;tag=f85b0bd16aaafa8479586ac9f88b3198-10a0
Call-ID: f602824f-1a8e-e011-9efc-0024d693d8e8@snoopy
To: sip:eugen.d...@ekiga.net;tag=4888824f-1a8e-e011-9efc-0024d693d8e8
Contact: <sip:86.64.162.35:5060>
Subscription-State: active;expires=370
Event: presence
Content-Length: 0
Max-Forwards: 70
To resume: What does SIP standard say about this NOTIFY with empty body?
Does this mean that the user xyz is offline?
Or does this mean that user's status has not changed? In fact, the
NOTIFY with empty body (as shown above) is the first one sent by
kamailio, so there is no "previous" state of that user, hence
"unchanged" status has no meaning.
Thank you,
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
