[cisco-voip] CID manipulation question

[Steven Jack]

I wonder if someone can help I am using Callmanager v5.1 which is connected
to our aged GPT/Siemens telephone exchange on a single E1 circuit via a
Westell DPNSS to QSIG gateway and 2821 Router.
To make a call to a pbx extension requires us to prefix the extension number
with 1234, however to call the outside world requires us to prefix 123456.
It seems that I can only add this to a route pattern which means that the
prefix+dialed_number appears on the phone display as the number dialed. 

Similarly an incoming call comes in with a prefix 5678 so I have a
translation pattern that takes 5678.XXXX and strips the PreDot, however the
CID now shows the prefix on the dialed phone. I can't add a calling party
mask as I have no way of knowing whether the call is local to the PBX or
external as the all come in via the same route.

It is highly possible I am missing the obvious and would be grateful for any
suggestions

Steven

Steven Jack 
University of Glasgow