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Chapter 4: Configuring your VOIP
Multi-Tech Systems, Inc. 52
DID Parameters
The parameters applicable to the Direct Inward Dial (DID) telephony interface type are shown in the figure
below and described in the table that follows. The DID interface allows one phone line to direct incoming
calls to any one of several extensions without a switchboard operator. Of course, one DID line can
handle only one call at a time. The parameters described here pertain to the customer-premises side of
the DID connection (DID-DPO, dial-pulse originating); the network side of the DID connection (DID-DPT,
dial-pulse terminating) is not supported.
The –SS and –FX models do not support DID.
Figure 4-12: DID parameters
DID Interface Parameter Definitions
Field Name
V
alues Description
Interface DID-DPO Enables the customer-premises side of DID functionality
DID Options
MultiVOIP’s use of DID applies only for incoming DID calls. The Start
Mode used by the MultiVOIP must match that used by the originating
telephony equipment; else DID calls cannot be completed.
Start Modes Immediate Start,
Wink Start,
Delay Dial
For Immediate Start, the VOIP detects the off-hook condition initiated
by the telco central-office call and becomes ready to receive dial digits
immediately.
For Wink Start, the VOIP detects the off-hook condition. Then the
VOIP reverses battery polarity for a specified time (140-290 ms; a
“wink”) and then becomes ready to receive dial digits.
For Delay Dial, the VOIP detects the off-hook condition. Then the
VOIP reverses battery polarity for a specified time (reverse polarity
duration has wider acceptable range than for Wink Start) and then
becomes ready to receive dial digits.
Wink Timer
(in ms)
Integer values,
in milliseconds
This is the length of the wink for Wink Start and Delay Dial signaling
modes.
Applicable only when Start Mode parameter is set to “Wink Start” or
“Delay Dial.”
Dialing Options
Inter Digit Timer Integer values,
in seconds
This is the length of time that the MultiVOIP will wait between digits.
When the time expires, the MultiVOIP will look in the phonebook for
the number entered.
Default = 2.
Message Waiting
Indication
-- Not applicable to DID-DPO interface.
Inter-Digit
Regeneration
Timer
Integer values,
in milliseconds
This parameter is applicable when digits are dialed onto a DID-DPO
channel after the connection has been made. The length of time
between the outputting of DTMF digits.
Default = 100 ms.