IP or SIP trunk members are defined using a virtual trunk equipment location number that is sent from the communication server to the reporting adjunct. Two types of messages can send information about single trunk group members and about status changes (from measured to unmeasured, or from unmeasured to measured using the reporting adjunct) of trunk group members. For H.323 trunks the equipment location can be just a port number.

When IP or SIP trunk groups are administered on the communication server, the gateway location of the associated C-LAN board is determined for each trunk group member. When message information is sent to the reporting adjunct, the T virtual port number is mapped into a 9-digit number with leading zeros. For example, an IP trunk member with a port-id of T00001 is displayed on CMS as 000000001, and an IP trunk member with port-id of T00400 will be displayed on the reporting adjunct as 000000400.