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We are running a smaler real estete agency. We have our free pbx fixed for call traffic with goip gsm adapter trunk. In addition we would like to connect extra sim card in Android mobile phone also used for overhead calls. (Some sims are not supported in adapter device, to have it unlocked, can also be a solution here)
It is that the Android phone need to be used as extra SIP Trunk that is connected to pbx that certain extensions are able to make and receive calls. Majority of calls were outbound here.
Eargent (Budget 50-200 USD)