Grandstream Networks UCM630 Series User Manual page 332

FXS MWI Mode
FXO Frequency
Tolerance
DAHDI Settings
When users encounter issues such as audio delay in outbound calls using the analog trunk, they can adjust
DAHDI settings on the UCM to attempt to lessen or resolve the issues.
For the value of the option such as "32, half":
The number in the option indicates the number of read/write buffers for TDM (DAHDI).
The "Half", "Immediate" or "Full" option indicates the strategy when reading/writing data from buffer.
"Half": Data will be read/written from buffer when half of the buffer is occupied with data.
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"Immediate": Read/write from buffer whenever there is data occupying the buffer.
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"Full": Data will be read/written from buffer when buffer is fully occupied with data.
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Normally, DAHDI settings should be kept default and should be adjusted only when users encounter analog
trunk/Fax-related issues.
Configure the type of Message Waiting Indicator on FXS lines. The default
setting is "FSK".

FSK: Frequency Shift Key Indicator

NEON: Light Neon Bulb Indicator.
Allows users to adjust the tolerance of the FXO ringing frequency. 63Hz is
considered the standard value and is selected by default.
Figure 225: DAHDI Settings
UCM630X Series User Manual
Version 1.0.2.25
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