I was assisting in troubleshooting problems doing SIP Trunking to sipXecs. When accessing the service over public internet, we require digest authentication. When a User name for SIP authentication is configured and the "Use default asserted identity" box is checked, the value in the "User name" field gets put into the user part of the From URI and P-Asserted-Identity URI. This looks wrong. The "User name" field appears to be overloaded, being used for both SIP credentials and subscriber identification. Authentication credentials have nothing to do with subscriber identity. The value in the "User name" field should only be used in the Authorization header. It is completely unrelated to the identity of the caller. Is this a bug being tracked?
Below is text from the http://wiki.sipfoundry.org/display/xecsuserV4r2/SIP+Trunking page that supports what was observed. If the ITSP does not recognize this field and uses the From header for account identification, these features may not work as expected. if you select to "use default asserted identity", you must specify a user name so that the default Asserted Identity may be computed. John Hearty Level3 Communications
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