cisco gatekeeper Vs. non-cisco gatekeepe

We have a “voice master” gatekeeper. Last week we configured a new cisco 2620 as a gatekeeper . we created local and remote zones. The local zone works but the remote zone we configured to route the calls to the voice master. The cisco recieves the ARQ from the endpoint and forward the LRQ to the voice master and there returns a LCF but (it gives something like this ” asn- decoding error -13 ) cisco returns ARJ to the endpoint.
I ve read from cisco documents that cisco gatekeepers only work in “direct call signaling” mode and doesnt support “routed call signaling”. And i know that voice master works in a Routed call signaling mode.

Is it possible to make these to gatekeepers work together which works in different modes.

Can anyone please help me. Thanks.