If a user of a SIP endpoint registered to an Expressway configured with only the vidoe.com domain physically dials. ”6501”, what alias is presented in the SIP invite message?

If a user of a SIP endpoint registered to an Expressway configured with only the vidoe.com domain physically dials. ”6501”, what alias is presented in the SIP invite message?
A . 6501@<ip address of the endpoint
B . 6501
C . 6501 @<ip address of the Expressway
D . [email protected]

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Answer: C