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SIP Trunk incoming calls to AA and to another site

Hi 

I configured a couple of weeks ago, a SIP trunk to a GSM Gateway. It works alright for outbound calls. But for inbound calls something is not working when the call is transfered to Unity Connection and then forwarded to another site, this is the call flow.

OUTBOUND

CUCM > SIP TRUNK > GSM Gateway  > Cel phones

INBOUND

Cel phone or any other phone > GSM Gateway > SIP TRUNK > CUCM > Unity Connection Auto Attendant  > any dialed ext to the local site, call is established. But if I dialed an extension from another site with a prefix 81XXXX call si torn down.

Inbound Second Scenario

cel phone or any other phone > GW h323 E1 > CUCM   > Unity Connection Auto Attendant  > any extension dialed to the local site, call is established.

and calls to the other site are established.

This also works if customer dials internally to the auto attendant and then transfered to the 81XXXX extension.

Any clues?

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