making call using sip proxy through voip gateway

Hi,

We received a Mulitech MultiVoIP (voip-isdn) gateway that is connected to 
our ISDN PBX.
This gateway can be registered to the vocal sip proxy as simple user.

I would like that the vocal sip proxy would forward all calls beginning with 
a prefix to this voip gateway.
Is it possible to configure the sip proxy this way or somehow else to 
interact with the gateway?

|vocal gua |---> |vocal sip proxy| --> |gateway| --> |ISDN phone|


thanks in advanced
Tamas Patai


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