CNAM Services

Calling Name Intelligent Network Service The CNAM (Calling Name) service is an intelligent network service that displays a caller's name on a Caller ID device. The difference between CNAM and Enhanced Caller ID is that the caller's name displays along with, or instead of, the caller's phone number, whereas Enhanced Caller ID can only deliver both the name and the phone number of an incoming call.

CNAM Transport Flow With CNAM, the intelligent network performs several functions during a call sequence. Upon receipt of a terminating call (SIP termination service), the network switch first establishes whether the Enhanced Caller ID has been enabled by the terminating subscriber and determines whether the call is marked "restricted" and/or if the calling party number is available.

Once the switch has performed all three functions, it sends a query to a signal transfer point (STP.) The STP performs a Global Title (GT) translation, which is the SS7 equivalent to IP routing, and establishes the appropriate service control point (SCP) in order to direct the query to access the correct name information in its database.

Once the correct name has been identified, the SCP responds with the calling party's name, location (city and state) and/or an indicator of privacy.

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