2 external ISDN ports (pstn) - Problem outbound callerid

Hi,

i have 2 ISDN ports (pstn - "Deutsche Telekom") connected to a HFC quad ISDN card (2 ports used). Both registered as trunks in trixbox.
Outgoing and incoming calls are no problem.

For each of my extensions oubound callerid are set.

My problem is that the outbound callerid working only for one ISDN port.

For example:

Port A (first trunk):
1. MSN 11115
2. MSN 11116
3. MSN 11117
and so on

Port B (second trunk):
1. MSN 22225
2. MSN 22226
3. MSN 22227
and so on

Extension 400 outbound callerid = 22227

If the extension 400 calling out and get a free channel from Port A, the shown number is 11115 (not 22227).
If the extension 400 calling out and get a free channel from Port B, the shown number is 22227, like it should be.

So what can i do, to get 22227 shown even on Port A?

Thx Maiko