I have problems authenticating a SIP ATA to a foreign SIP Proxy.
When sending the Register message, the ATA inserts the tag "user=phone" into the from field. It seems that this string forces the Proxy in using only the tel part of the uri (12345)instead of the full sip uri (firstname.lastname@example.org)as the registering user to authenticate. Then the Proxy fails with a "user unknown" message.
Searching into the SIP ATA Administration Guide, I didn't find any parameters in order to remove the "user=phone" string.
Could someone help me?
Thanks in advance