[IP PBX series_IPX-2100/IPX-2200/IPX-2500] How to use the server pbx to make outgoing calls using the client pbx gsm sim

Once the SIP trunk is created between two IP PBXs, you can set the following to achieve the purpose.

1. Makes sure there is no problem for extensions to call each other. If the extensions can communicate with each other,

    it means that the SIP trunk is connected successfully.

2. Changes to dial permission for the SIP trunk. If the extension on the client PBX device can make outgoing calls via GSM trunk,

    the corresponding SIP trunk is able to call out from GSM trunk with the same dialing permission of this extension.