[GnomeMeeting-devel-list] register/cancel breakage

["Geoffrey D. Bennett" <g netcraft com au>]

Hi there,

There seem to be some oddities in Ekiga's register/cancel handling.
This is on startup:

First transmit of REGISTER message:

2006/03/18 23:33:15.392   0:02.548      GMAccounts...t:0a36bee0 SIP     Sending PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
REGISTER sip:alice.netcraft.com.au SIP/2.0
CSeq: 1 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bKdcfb2c3b-edb4-da11-9266-001125d23952;rport
[...]
2006/03/18 23:33:15.395   0:02.551        SIP Transport:a403fa8 SIP     Read thread started.
2006/03/18 23:33:15.395   0:02.551        SIP Transport:a403fa8 SIP     Waiting for PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>

Retransmit:

2006/03/18 23:33:15.441   0:02.597                  Housekeeper SIP     Transaction 1 REGISTER timeout, making retry 1
2006/03/18 23:33:15.442   0:02.598                  Housekeeper SIP     Sending PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
REGISTER sip:alice.netcraft.com.au SIP/2.0
CSeq: 1 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bKdcfb2c3b-edb4-da11-9266-001125d23952;rport

407 from server:

2006/03/18 23:33:15.675   0:02.831        SIP Transport:a403fa8 SIP     PDU Received on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
SIP/2.0 407 Proxy Authentication Required
Date: Sat, 18 Mar 2006 13:03:21 GMT
CSeq: 1 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bKdcfb2c3b-edb4-da11-9266-001125d23952;rport=5061;received=203.16.231.153:5061

REGISTER with credentials:

2006/03/18 23:33:15.675   0:02.831        SIP Transport:a403fa8 SIP     Transaction 1 REGISTER completed.
2006/03/18 23:33:15.675   0:02.831        SIP Transport:a403fa8 OpalUDP Ended connect, selecting 203.16.231.153:5061
2006/03/18 23:33:15.675   0:02.831        SIP Transport:a403fa8 SIP     Received Proxy Authentication Required response
2006/03/18 23:33:15.676   0:02.832        SIP Transport:a403fa8 SIP     Adding authentication information
2006/03/18 23:33:15.677   0:02.833        SIP Transport:a403fa8 SIP     Sending PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
REGISTER sip:alice.netcraft.com.au SIP/2.0
CSeq: 2 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bK06a1583b-edb4-da11-9266-001125d23952;rport

Duplicate 407 from server (because of the retransmit):

2006/03/18 23:33:15.677   0:02.833        SIP Transport:a403fa8 SIP     Waiting for PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
2006/03/18 23:33:15.755   0:02.911        SIP Transport:a403fa8 SIP     PDU Received on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
SIP/2.0 407 Proxy Authentication Required
Date: Sat, 18 Mar 2006 13:03:22 GMT
CSeq: 1 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bKdcfb2c3b-edb4-da11-9266-001125d23952;rport=5061;received=203.16.231.153:5061

Then it gets weird -- Ekiga sends a CANCEL for the REGISTER that had
the credentials?!

2006/03/18 23:33:15.755   0:02.911        SIP Transport:a403fa8 SIP     Transaction 1 REGISTER completed.
2006/03/18 23:33:15.756   0:02.912        SIP Transport:a403fa8 SIP     Sending PDU on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
CANCEL sip:alice.netcraft.com.au SIP/2.0
CSeq: 2 CANCEL
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bK06a1583b-edb4-da11-9266-001125d23952;rport

The server responds to the REGISTER:

2006/03/18 23:33:16.161   0:03.317        SIP Transport:a403fa8 SIP     PDU Received on udp$203.16.231.11:5060<if=udp$203.16.231.153:5061>
SIP/2.0 200 OK
Date: Sat, 18 Mar 2006 13:03:22 GMT
CSeq: 2 REGISTER
Via: SIP/2.0/UDP 203.16.231.153:5061;branch=z9hG4bK06a1583b-edb4-da11-9266-001125d23952;rport=5061;received=203.16.231.153:5061

Ekiga shows that the user is logged in now, but RFC 3261 Section 9.1
says "A CANCEL request SHOULD NOT be sent to cancel a request other
than INVITE."  I'm not sure what the purpose of trying to CANCEL that
REGISTER is anyway?

Thanks,
-- 
Geoffrey D. Bennett, RHCE, RHCX               mailto:g netcraft com au
Senior Systems Engineer                          sip:g netcraft com au
NetCraft Australia Pty Ltd        http://www.netcraft.com.au/geoffrey/