[asterisk-users] Asterisk to asterisk IAX trunk

[Jonathan Archer]

Hi guys,
This may be a fairly simple answer but here's my problem

I have 2 Asterisk servers on 2 sites connected via an IAX trunk

If user 1001 on site a wants to call user 1001 on site b they will dial
51001

This is taken care of by a 5|XXXX dialing rule on the outbound route.
The problem I'm having is that when the call ends up at site b it looks
like user 1001 is being called by 1001 (i.e. themselves) 

How can I get the 5 to stay where it is so that lookups work correctly?
is it part of the outbound CID?

Cheers

Jon