This addendum provides the following enhancements to the Project 25 Trunking Control Channel Messages (TIA-102.AABC-E) standard:

1. Adds new message in support of the Location on PTT functionality.

This document only includes information relevant to the scope as described above. The reader is referred to TIA-102.AABC-E for all other pertinent information. The next complete revision of TIA-102.AABC-E will incorporate the changes contained in this addendum.

Note that section numbers identified in this addendum directly translate to section numbers in the TIA-102.AABC-E, Project 25 Trunking Control Channel Messages.