User manual

Four-Channel GSM VoIP Gateway
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SMS prefix can be used in mode 2 just like in mode 1.
 Mode 3 example:
GoIP4 use SMS Dial Mode 3:
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*(86)13800000000, and the caller number is GoIP4’s SIP account number.
The sent-out signaling as follow: