How to set a CID prefix for internal numbers that came through the iax trunk from another branch?

Question

Asterisk

There are 2 Asterisk (Elastix4), iax2 trunk is created, internal numbering is intersected, in order to call branch numbers in outgoing routing, a prefix 2 is added for a call from 1st to 2nd and 1 for a call from 2nd to 1 th, after which Asterisk removes this prefix and transmits only the internal number over the trunk, there are some inconveniences when both numbers have the same numbers, the one who received the call sees the number and name scored on Asterisk at their branch, and not the one who called from 1 th. How to make sure that when calling between branches, the required prefix is ​​added to the incoming number and the employee understands that the call did not come from someone on his branch, but from another, on incoming routes for providers, there is an option "Prefix for number ID" (CID name prefix) and the employee displays the entered characters + number?