The Universal Call ID (UCID) is an Avaya proprietary call identifier used in contact center applications. Applications use UCID for monitoring, controlling, and recording of calls at non-SIP interfaces of CTI. Applications can also use UCID to track call history.

In Avaya Contact Center – Extended Capacity, the UCID is an eight-byte number, expanding to a 20-digit decimal number. UCID consists of the network node ID, call sequence number, and time stamp of the call. The administrator can configure the node ID on the Configuration Server web portal. For more information about UCID configuration, see the global configuration section in Administering Avaya Contact Center – Extended Capacity.