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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