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SIP Operation Manual V2.6
Fax Settings
T.38: The T.38 protocol is used for better and faster facsimile transmission. When this function is
enabled, the following fax and voice parameter settings will be disabled, so it is recommended to
enable this function to gain better fax quality. When this function is enabled, please select UDP,
TCP, or AUTO. If selecting TCP and some routers cannot use the Fax function, please select UDP
instead.
Enable High Quality: The system sends the same FAX frame twice to get a high quality of the FAX.
It requires more bandwidth.
Enable Secure T.38: This allows VoIP gateways to send faxes on both sides.
T.30: The system uses T.30 as the protocol for fax transmission. The parameter settings are the
same as for voice transmission. However, enabling the fax function will consume more network
resources and will affect transmission quality.
FAX Detect sensitivity
：
Used to adjust the sensitivity of detection as to whether a phone call is a
FAX or not.
Digit Map
There are 50 sets of leading digit entries to choose voice routing interface – Auto select, PSTN or VoIP.
Enable: Enable detection of this entry.
Leading Digits: The leading digits for gateway to scan while user is dialing.
Total Digit Count: Total number of digits that gateway should accept. 0 disables this feature.
Interface: The interface calls should go through if above conditions satisfied.
