Avaya UCID - Demystified

Avaya UCID consists of three parts:

1) Node ID (N)

2) UCID - Sequence number (S)

3) Timestamp (T)

Node ID (N): A number between 1 and 32767. It is a unique number to identify the switch in the network that generated the call.

UCID - Sequence number (S): A number between 1 and 65535. This number uniquely identifies the call in a given node.

Timestamp (T): This time is the number of seconds since epoch (midnight 1 Jan, 1970) at the time of call origination.

UCID Format

Format of UCID is : NNNNNSSSSSTTTTTTTTTT

Where N stands for Node ID, S for UCID-Sequence number and T for timestamp.

CM generated UCID for all calls originating at the switch. If UCID exists for an incoming call, CM stores the UCID without any modification. For incoming calls without UCID, the switch generate a UCID for the call. For calls spanning multiple switches, the UCID is sent along with call information during call setup scross the network (which would imply PRI with QSIG).

Example: Assume a call has the following information stored in its call record

Node ID: 21; UCID - Sequence Number: 5; Timestamp: 946085673

The generated UCID in ASCII format will be: 00021000050946085673