Thanks for you reply.
On further examination of the very basic logging information I could find on that server, I am inclined to agree with your theory that it may be a particular UA causing these errors.
The logs seem to show that this particular error is only generated shortly after this particular UA attempts registration, as before and after that, there were no such errors for other users. Further more, This error is only generated for Registration atempts and does not seem to occur during call setup, INVITES, etc. - which makes sense from the error descriptoin which seems to be implying that Openser is having trouble creating/building the contact header for the REGISTER. The errors are almost certainly to do with this UA as I have just counted over 20 instances all occurring only after this UA.
I will certainly look more into this to confirm this.
The trouble is this often happens fairly late at night when every one is asleep, making it hard to get a live trace as I don't know when exactly this guy is going to connect, but I'll see what I can do. Unfortunately, we took off most of the syslog logging from the server as syslog performance was becoming an issue with performance (read one of my previous posts :)), so I can't get a full packet dump from the openser server itself.
Looking further into this I managed to pull up some Ethereal traces from a different machine we use for tracing and loggin on the same network, and the device seems to be a Sipura SPA 2002-3.1.2(a).
Since I can't find a Register message, I can only show you an INVITE but I guess it will still have the same contact header as we are not overwriting the contact information anywhere I know of:
Session Initiation Protocol
Request-Line: INVITE sip:5068831424@<SIP AS>:5060 SIP/2.0
Method: INVITE
Resent Packet: False
Message Header
Record-Route: <sip:<OPENSER IP>;ftag=935c557f841a75c7o0;lr=on>
Via: SIP/2.0/UDP <OPENSER IP>;branch=z9hG4bK2f26.41279b67.0
Via: SIP/2.0/UDP
192.168.1.100:16384;rport=16384;received=
165.98.158.187
;branch=z9hG4bK-b8411887
From: <sip:071159040628330829@<OPENSER DOMAIN>>;tag=935c557f841a75c7o0
SIP from address: sip:071159040628330829@<OPENSER DOMAIN>
SIP tag: 935c557f841a75c7o0
To: <sip:5068831424@<OPENSER DOMAIN>>
SIP to address: sip:5068831424@<OPENSER DOMAIN>
Call-ID:
a0a739df-fb05dce7@192.168.1.100
CSeq: 101 INVITE
Max-Forwards: 69
Contact: <sip:071159040628330829@165.98.158.187:16384>
Expires: 240
User-Agent: Sipura/SPA2002-3.1.2(a)
Content-Length: 428
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Supported: x-sipura
Content-Type: application/sdp
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 11350715 11350715 IN IP4
192.168.1.100 Owner Username: -
Session ID: 11350715
Session Version: 11350715
Owner Network Type: IN
Owner Address Type: IP4
Owner Address:
192.168.1.100 Session Name (s): -
Connection Information (c): IN IP4
192.168.1.100 Connection Network Type: IN
Connection Address Type: IP4
Connection Address:
192.168.1.100
Time Description, active time (t): 0 0
Session Start Time: 0
Session Stop Time: 0
Media Description, name and address (m): audio 16402 RTP/AVP 4 0 2 8 18 96 97 98 100 101
Media Type: audio
Media Port: 16402
Media Proto: RTP/AVP
Media Format: ITU-T G.723
Media Format: ITU-T G.711 PCMU
Media Format: ITU-T
G.721
Media Format: ITU-T G.711 PCMA
Media Format: ITU-T G.729
Media Format: 96
Media Format: 97
Media Format: 98
Media Format: 100
Media Format: 101
Media Attribute (a): rtpmap:4 G723/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 4 G723/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 0 PCMU/8000
Media Attribute (a): rtpmap:2 G726-32/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 2 G726-32/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 8 PCMA/8000
Media Attribute (a): rtpmap:18 G729a/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 18 G729a/8000
Media Attribute (a): rtpmap:96 G726-40/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 96 G726-40/8000
Media Attribute (a): rtpmap:97 G726-24/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 97 G726-24/8000
Media Attribute (a): rtpmap:98 G726-16/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 98 G726-16/8000
Media Attribute (a): rtpmap:100 NSE/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 100 NSE/8000
Media Attribute (a): rtpmap:101 telephone-event/8000
Media Attribute Fieldname: rtpmap
Media Attribute Value: 101 telephone-event/8000
Media Attribute (a): fmtp:101 0-15
Media Attribute Fieldname: fmtp
Media Attribute Value: 101 0-15
Media Attribute (a): ptime:30
Media Attribute Fieldname: ptime
Media Attribute Value: 30
Media Attribute (a): sendrecv