# PCS-user information elements

The user-to-PCS and PCS-to-user information elements are network-specific information elements coded using codeset 6, used to transmit information between the user and a PCS (Point de Commande de Service). They are used in the French ISDN variant (VN6). These information elements can be included in several ISDN message types, in the call setup, call connected, and call disconnection phases.

## Structure of user-PCS IEs

Each user-to-PCS and PCS-to-user information element includes a protocol discriminator field and an information area.

This information area contains differing amounts of information, depending on the associated message type:

For these message types... | The information area of the PCS IEs can consist of...
FACILITY | As many as 128 octets
ALERTING DISCONNECT PROGRESS RELEASE RELEASE COMPLETE SETUP | As many as 64 octets