Dialing number shown differently depending on number dialed (both "external").

[Keibo]

First off: I'm not as bad at the PBX as I am at explaining it in the correct way...

We used to not display any called ID when we did external calls but now we want to but some of our users want to display a custom number instead when making EXTERNAL calls.

Easy enough with two different types of CLID.
ENTRY 0
HNTN
HLCL 50050 <- the mentioned custom number
DIDN NO
DIDN_LEN 0
HLOC
LSC
CLASS_FMT DN

ENTRY 1
HNTN
HLCL
DIDN YES
DIDN_LEN 0
HLOC
LSC
CLASS_FMT DN

This worked liked a charm for normal external calls.

Now to the problem at hand:
Some of our INTERNAL cell-phones are on a phantom which forwards the call over another RLT & route (by using SPN). Our service provider call this route MDA, not sure what the correct english phrase is. These cell-phone users are used to and supposed to see the called ID, even from the ones that don't wish to show their DN externally.

Now of course this is no problem with CLID 1 above but CLID 0 is beyond my understanding. How can I change which CLID or which number is displayed when the calling party dials a specific number (one of our cell-phones)? These cell-phones already as i mentioned earlier in AC2 SPN-tree and have a specific ARLI.

Any ideas?