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larger than the delay required to complete the PSTN caller ID delivery.
DTMF Dial Pause (ms)
Dial pause is the time between 2 digits for the same scenario as explained above.
First Digit Timeout (sec)
Used for PSTN to VoIP calls. PSTN users need to enter the FIRST digit within the first
digit timeout period. Otherwise the call will be dropped.
Inter Digit Timeout
When dialing from the PSTN to VoIP, subsequent digits have to be input within the
period of inter-digit timeout. Otherwise the dial plan thinks it is the end of the digit input.
Wait for Dial Tone
Wait for Dial tone is used for one stage VoIP to PSTN calls. If set to Yes, the device
will first obtain a PSTN line and a dial tone from a central office. After obtaining the dial
tone, the digits dialed will be sent to the central office.
Stage Method (1/2)
This configuration is applicable for VoIP to PSTN calls and indicates one or two stage
dialing methods.
Note: General settings have the same meaning as explained in the FXS page definitions. Here they are
described only as parameters related to the FXO port.
TABLE 12: HT503 CALL PROGRESS TONES SETTINGS PAGE DEFINITIONS
Call Progress Tones
Using these settings, user can configure tone frequencies according to their preference.
By default they are set to North American frequencies.
Frequencies should be configured with known values to avoid uncomfortable high pitch
sounds. ON is the period of ringing (“On time” in ‘ms’) while OFF is the period of
silence. In order to set a continuous tone, OFF should be zero. Otherwise it will ring ON
ms and a pause of OFF ms and then repeat the pattern.
Grandstream Networks, Inc. HT503 User Manual Page 30 of 35
Firmware 1.0.0.6 Last Updated: 6/2007