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5.3.4 Advanced VoIP
The parameters in the Advance VoIP section are common for all configuration modes. In general, these
parameters are preconfigured with factory defaults. Users should only modify the parameters required.
The table below summaries all the parameters defined in this section.
Parameter
(Advanced VoIP)
Description
Default Value
1. SIP Listening Port Mode
Port Number
SIP Local port defines the network port number that the device listens for incoming SIP
messages. This port number is sent to the SIP Sever/Proxy during SIP registration.
This setting defines if this port is pre-assigned to a fixed number or a randomly
generated port number (5060 to 6060).
This specifies the port number when the SIP Local Port Mode is set to “Fixed”.
5060
2. SIP INVIITE Response
One of the key function of the device is to allow call terminations from VoIP to GSM.
In general, a VoIP caller dials a PSTN or GSM number (E.164) number and the SIP Server
routes this call to the device by sending a SIP INVITE message. This parameter
specifies the response to the INVITE message. The three possible responses are
described in details below.
1. SIP 200 OK - This response inform the SIP server that the call is answered and the
call duration timers starts immediately. If billing applies, the call is charged
(immediately) even before the call is answered.
2. SIP 180 then 183 - The device first sends back a SIP 180 Ringing to the calling SIP
device to generate a local ring. The caller hears a ringback tone immediately
after the call is dialed. When a ringback tone is received from the GSM network,
a SIP 183 Session In Progress message is sent to the calling party to start early
SIP 180 then
183
Summary of Contents for GoIP
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