User manual

Four-Channel GSM VoIP Gateway
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SMS prefix can be used in mode 3 just like in mode 1.
3.6.3 SMS Relay
GoIP4 GSM Gateway supports SMS relay.
The SMS Forward Number is the receiver (ex. an extension) on your VoIP system. GoIP4 will
forward the SMS it received to the number.
3.6.3.1 SMS Relay To VoIP System
When GoIP4 receives a SMS from GSM network, it will relay to VoIP system’s appointed
number (SMS Forward Number).
Assume the SMS Forward Number is 3999 and SMS sender number is “8613682626865 “, the
SMS content is “075583185700 “. The GoIP4 will send a message to your VoIP system as
below: