GoIP User Manual
http://www.dbltek.com
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REFER, REGISTER, MESSAGE, INFO, SUBSCRIBE
Content-Type: application/sdp
2. Forward Function – This mode supports SMS forwarding from GSM to SIP and from SIP to GSM.
a) Received GSM SMS messages are forwarded to both SIP and GSM depending on the settings of the
SMS Forward Number and SMS Forward GSM Number.
When an incoming GSM SMS is received, it can be forwarded automatically to another GSM
number as specified by the SMS Forward GSM Number. The received SMS can also be forwarded
automatically to a a SIP number or extension as specified by the SMS Forward Number. If this
number is not set, this feature is disabled. Forwarding GSM SMS to SIP is achieved via the SIP
MESSAGE command. An example of a SIP MESSAGE is shown below. Please note that the
number of the GSM SMS Sender is added as part of the message (the last two lines in the SIP
GSM SMS Sender = 861361234567
GSM SMS Content = 075583185700
SIP MESSAGE Sent to SIP Server:
MESSAGE sip:3999@192.168.2.1 SIP/2.0
Via: SIP/2.0/UDP 192.168.2.162:5060;branch=z9hG4bK1967685528
From: <sip:20001@192.168.2.1>;tag=667435795
To: <sip:3999@192.168.2.1>
Call-ID: 2094144847@192.168.2.162
Contact: <sip:20001@192.168.2.162:5060>
Please note that the SIP Server side must be programmed to process this SIP MESSAGE according to
the application needed. It can forward the message to the SIP number with the Caller ID as the
GSM SMS Sender. If the message content is a phone number for a called party, it is then possible
to implement the Call Back function by using the content of the SIP message.
If the SMS GSM Recipient is set, the received GSM SMS is forwarded to this recipient via the same
GSM channel which receives the SMS.
b) A SMS can be sent to the device via its SIP number. The content of the SMS must be in the preset
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