> Contact:<sip:anonymous.invalid;phone-context=+1
@domain.com:5060;maddr=10.10.10.10;transport=udp;user=phone>
> 
> Please note I have changed the domain and the IP.
> 
> We reject the INVITE with SIP/2.0 400 Bad Request 
> - 'Malformed/Missing Contact field'
> 
> In RFC3261 I see that the INVITE must contain a 
> Valid Contact Header to be used for subsequent 
> requests, but I'm not sure if the above is valid.
> 
> Can anyone comment?

The contact's validity depends upon the ambiguous meaning of user=phone.  The 
user=phone is present; however the user portion is not a valid 
telephone-subscriber per RFC 2806/3966.

Unfortunately since I don't think that sipcore has clarified the meaning of 
user=phone, you should likely accommodate user=phone without requiring the user 
portion to be present and/or decode as telephone-subscriber.


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