Two-Stage Dialing; Did Wink - AudioCodes Mediant 800B MSBR User Manual

Mediant 800B MSBR

Answer Supervision: The Answer Supervision feature enables the FXO device to
determine when a call is connected, by using one of the following methods:
•
Polarity Reversal: the device sends a 200 OK in response to an INVITE only
when it detects a polarity reversal.
•
Voice Detection: the device sends a 200 OK in response to an INVITE only
when it detects the start of speech (fax or modem answer tone) from the Tel side.
Note that the IPM detectors must be enabled.
31.13.1.2

Two-Stage Dialing

Two-stage dialing is when the IP caller is required to dial twice. The caller initially dials to
the FXO device and only after receiving a dial tone from the PBX (via the FXO device),
dials the destination telephone number.
Two-stage dialing implements the Dialing Time feature. Dialing Time allows you to define
the time that each digit can be separately dialed. By default, the overall dialing time per
digit is 200 msec. The longer the telephone number, the greater the dialing time.
The relevant parameters for configuring Dialing Time include the following:

DTMFDigitLength (100 msec): time for generating DTMF tones to the PSTN (PBX)
side

DTMFInterDigitInterval (100 msec): time between generated DTMF digits to PSTN
(PBX) side
31.13.1.3

DID Wink

The device's FXO ports support Direct Inward Dialing (DID). DID is a service offered by
telephone companies that enables callers to dial directly to an extension on a PBX without
the assistance of an operator or automated call attendant. This service makes use of DID
trunks, which forward only the last three to five digits of a phone number to the PBX. If, for
Version 6.8
Figure 31-10: Call Flow for Two-Stage Dialing
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31. Analog Gateway
Mediant 800B MSBR