I need to set a caller ID number on faxes leaving our environment.
RightFax --> SIP TRUNK --> Call Manager 9.1--> CUBE --> SIP to ATT
Here is the DECLINE I'm getting from ATT
SIP/2.0 603 DeclineVia: SIP/2.0/UDP (IP Address):5060;branch=z9hG4bK18AEB1...