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4) The installation for connecting VoIP gateway for Call Termination
Suppose a VoIP call originates from US, which was transferred from US Server to China Server
on VoIP, finally the call will be terminated from internet to GSM network and to be sent out to the
destination answer side.
The sketch for connecting to VoIP gateway
5) The installation for connecting to alarm system for Security
The GSM FWT can substitute the PSTN for connecting to alarm system for security purpose
when PSTN failure or not available.
The sketch for connecting to alarm system
