# Call identification services overview

This section describes supplementary services related to identification of one party to another. The following identification services are implemented in NMS ISDN:

Identification service | Description
Calling name identification presentation (CNIP) | The called party receives the name of the calling party. Available only under the Q.SIG variant.
Connected name identification presentation (CONP) | The calling party receives the name of the called party. Available only under the Q.SIG variant.
Calling line identification presentation (CLIP) | The called party receives the calling party's address information.
Calling line identification restriction (CLIR) | Prevents the calling party's address information from being presented to called users.
Connected line identification presentation (COLP) | Allows the calling party to determine the connected party's address information.
Connected line identification restriction (COLR) | Restricts the calling party from determining the connected party's address information.

## Invoking identification services

None of the identification services require exchange of information using extended data structures. All information is exchanged in fields in the basic call control primitives.

For information on filling the macros and sending the messages documented in this section, see the NMS ISDN Messaging API Developer's Reference Manual.