Hi,

I am trying to register my Nokia E72 with our business telephone system. I have a trace of the registration below and as you can see the phone fails to register. I am being told from the manufacturer it is because the phone is sending the Contact in a different fashion, ie random string.
I have spent a week on forums and I appreciate it is nokias intpretation of the SIP model however I have also noticed many many users complaining of this.
Is their any changes I can make to my phone so that that the contact is sent as sip:880@10.1.1.6

1829877242mS SIP Rx: UDP 10.1.1.82:5060 -> 10.1.1.6:5060
REGISTER sip:10.1.1.6;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 10.1.1.82:5060;branch=z9hG4bKlg8qvmvmq5hc6iucp71ee​ua;rport
From: <sip:880@10.1.1.6>;tag=1f8avmpa99hc6k2bp712
To: <sip:880@10.1.1.6>
Contact: <sip:FbBap7TRia0MZ0ZWYbL3@10.1.1.82;transport=UDP>​;expires=3600
CSeq: 4894 REGISTER
Call-ID: -UuLSQaDoId5BID2Z0jsdKZTClK-Ht
User-Agent: Nokia RM-530 022.007
Max-Forwards: 70
Content-Length: 0

1829877245mS SIP Reg/Opt Rx: phone
REGISTER sip:10.1.1.6;transport=UDP SIP/2.0
Via: SIP/2.0/UDP 10.1.1.82:5060;branch=z9hG4bKlg8qvmvmq5hc6iucp71ee​ua;rport
From: <sip:880@10.1.1.6>;tag=1f8avmpa99hc6k2bp712
To: <sip:880@10.1.1.6>
Contact: <sip:FbBap7TRia0MZ0ZWYbL3@10.1.1.82;transport=UDP>​;expires=3600
CSeq: 4894 REGISTER
Call-ID: -UuLSQaDoId5BID2Z0jsdKZTClK-Ht
User-Agent: Nokia RM-530 022.007
Max-Forwards: 70
Content-Length: 0

1829877246mS Sip: (fe143240) SendSIPResponse: REGISTER code 400 SENT TO 10.1.1.82 5060
1829877247mS SIP Reg/Opt Tx: phone
SIP/2.0 400 Bad Request
Via: SIP/2.0/UDP 10.1.1.82:5060;branch=z9hG4bKlg8qvmvmq5hc6iucp71ee​ua;rport
From: <sip:880@10.1.1.6>;tag=1f8avmpa99hc6k2bp712
To: <sip:880@10.1.1.6>;tag=61efada29dd7b8a5
Call-ID: -UuLSQaDoId5BID2Z0jsdKZTClK-Ht
CSeq: 4894 REGISTER
User-Agent: IP Office 5.0 (15)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, SUBSCRIBE, REGISTER, PUBLISH
Content-Length: 0

1829877248mS SIP Tx: UDP 10.1.1.6:5060 -> 10.1.1.82:5060
SIP/2.0 400 Bad Request
Via: SIP/2.0/UDP 10.1.1.82:5060;branch=z9hG4bKlg8qvmvmq5hc6iucp71ee​ua;rport
From: <sip:880@10.1.1.6>;tag=1f8avmpa99hc6k2bp712
To: <sip:880@10.1.1.6>;tag=61efada29dd7b8a5
Call-ID: -UuLSQaDoId5BID2Z0jsdKZTClK-Ht
CSeq: 4894 REGISTER
User-Agent: IP Office 5.0 (15)
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, INFO, SUBSCRIBE, REGISTER, PUBLISH
Content-Length: 0