Four-Channel GSM VoIP Gateway
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Mode 2 example:
GoIP4 use SMS Dial Mode 2:
A mobile phone’s number is (86)13800000000, it sends a SMS “8675588228822” to GoIP4’s
GSM SIM card. When GoIP4 device receives this SMS, it will automatically call the number
8675588228822, and the caller number is GoIP4’s SIP account number.
GoIP4 will set the SMS sender number to “
Call Divert
“option’s “
Forward Number (VoIP to
PSTN
” automatically. The result is, when SIP server receives the SMS call and call back to
GoIP4, GoIP4 will automatically call the SMS sender via GSM network.
The sent-out signaling as follow: