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SIP Operation Manual
Example:
If PBX extension needs to dial “0” to make a PSTN call, and the FXO ports are connected to
PBX extension. In this case, the Dial-out prefix should be set to “0”. If the PBX requires some
delay time before capturing a line, then the trunk prefix should be set as “0,” so that after
dialing a 0, it will pause for 1 second before dialing the destination number. Each comma
represents a 1 second delay. If more delay time is required, simply add more commas.
NOTE: If a Dial-out prefix is set, the line won’t be able to dial to any PBX extension line (FXS interface
does not have a trunk prefix function).
FXS Group: Tick the check box to select group hunting when there is an incoming call
and the gateway will automatically assign an unassigned call according to the
Hunting
Priority
. If Port 2 does not want to be set as an assigned line to receive any inbound calls,
the function can be disabled. Users can also use the Up or Down Key to adjust hunting
priority (No setting is required for the FXO interface).
FAX / Modem: Select the mode to detect if there is a fax tone and transfer the call to a fax
line.
Disable:
Stop to detect fax tone automatically.
T.38 Fax:
Use T.38 as the protocol for fax transmission. T.38 is used for better and faster
facsimile transmission. It is recommended to enable T.38 to gain better fax quality without
setting fax and voice parameter.
T.30 Fax:
Use T.30 as the protocol for fax transmission. It will consume more network
resources and will affect transmission quality. The gateway is still able to change the
protocol from T.38 to T.30 if the called party uses T.38 for fax transmission.
T.30 Fax/Modem:
Use it as the protocol for transmission of fax/modem over IP network.
T.30 Only:
Only use T.30 as the protocol for fax transmission. The gateway won’t accept
T.38 for fax transmission.
