[Serusers] Why does this CANCEL not stop INVITE attempts?

[Java Rockx]

Hi All.

Here is the tail end of a SIP conversation where a PSTN gateway
(216.229.127.60) has sent my SER-0.9 server (10.3.0.221) a CANCEL
request.

SER replied with a 200OK (which looks a bit suspicious), but then
another INVITE attempt was sent out to the UA (216.79.198.156)

Can anyone give me a hint as to what might cause CANCEL to not destroy
this SIP transaction?

Regards,
Paul

U 2005/03/10 14:42:15.366046 10.3.0.221:5060 -> 216.79.198.156:15060
INVITE sip:3212514273 at 192.168.1.102:5060 SIP/2.0.
Record-Route: <sip:10.3.0.221;ftag=73767738-B82;lr>.
Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK18a5.75d0c4f5.0.
Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118.
Via: SIP/2.0/UDP 66.243.109.99:5060;branch=065c3d8f328ab962f47c763927c80fb3.
To: 3212514273 <sip:3212514273 at 66.243.109.99:5060>.
From: sip:7046639230 at 66.236.245.98;tag=73767738-B82.
Call-ID: 8853950-3319472564-815436 at 66.243.109.99.
CSeq: 1 INVITE.
Max-Forwards: 3.
Contact: sip:7046639230 at 66.243.109.99:5060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Content-Type: application/sdp.
Content-Length: 229.
.
v=0.
o=NexTone-MSW 1234 8890 IN IP4 66.236.245.98.
s=sip call.
c=IN IP4 10.3.0.221.
t=0 0.
m=audio 36134 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=ptime:20.

U 2005/03/10 14:42:19.101381 216.229.127.60:5060 -> 10.3.0.221:5060
CANCEL sip:3212514273 at 10.3.0.221:5060 SIP/2.0.
Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118.
To: 3212514273 <sip:3212514273 at 66.243.109.99:5060>.
From: sip:7046639230 at 66.236.245.98;tag=73767738-B82.
Call-ID: 8853950-3319472564-815436 at 66.243.109.99.
CSeq: 1 CANCEL.
Max-Forwards: 70.
Content-Length: 0.
.
 
#
U 2005/03/10 14:42:19.104349 10.3.0.221:5060 -> 216.229.127.60:5060
SIP/2.0 200 ok -- no more pending branches.
Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118.
To: 3212514273 <sip:3212514273 at 66.243.109.99:5060>;tag=460b1844bd2d60209b47f7192c6e19c1-ae96.
From: sip:7046639230 at 66.236.245.98;tag=73767738-B82.
Call-ID: 8853950-3319472564-815436 at 66.243.109.99.
CSeq: 1 CANCEL.
Content-Length: 0.
.
 
##
U 2005/03/10 14:42:19.406049 10.3.0.221:5060 -> 216.79.198.156:15060
INVITE sip:3212514273 at 192.168.1.102:5060 SIP/2.0.
Record-Route: <sip:10.3.0.221;ftag=73767738-B82;lr>.
Via: SIP/2.0/UDP 10.3.0.221;branch=z9hG4bK18a5.75d0c4f5.0.
Via: SIP/2.0/UDP 216.229.127.60:5060;branch=z9hG4bK9903a47ad9d-bb412118.
Via: SIP/2.0/UDP 66.243.109.99:5060;branch=065c3d8f328ab962f47c763927c80fb3.
To: 3212514273 <sip:3212514273 at 66.243.109.99:5060>.
From: sip:7046639230 at 66.236.245.98;tag=73767738-B82.
Call-ID: 8853950-3319472564-815436 at 66.243.109.99.
CSeq: 1 INVITE.
Max-Forwards: 3.
Contact: sip:7046639230 at 66.243.109.99:5060.
Record-Route: <sip:216.229.127.60:5060;lr>.
Content-Type: application/sdp.
Content-Length: 229.
.
v=0.
o=NexTone-MSW 1234 8890 IN IP4 66.236.245.98.
s=sip call.
c=IN IP4 10.3.0.221.
t=0 0.
m=audio 36134 RTP/AVP 18 101.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=ptime:20.