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How to setup GSM gateway as trunk when registered as extension


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I have a GSM SIP gateway for routing mobile calls to and from the pbx. I have relocated the GSM gateway to a different network, in the different country (no longer on the same LAN and the pbx). How can I configure the pbx to see the GSM SIP gateway as a trunk for routing calls outbound thru the cellular network and forwarding inbound calls from the GSM SIM to the AA of the pbx? I have the GSM gateway regiseter as an extension on the pbx, the second stage is where I am stuck. I would also like the call process to be as follows: when extension dial any number beginning with 56xxxxxxxxx call is routed to the GSM gateway. When someone dials the SIM number call is routed to the pbx AA, then caller can dial extension etc.

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