Two-Stage Dialing - AudioCodes Mediant 800B User Manual


Time to Wait Before Dialing: Defines the time (in msec) between seizing the FXO
line and starting to dial the digits. The ini file parameter WaitForDialTime is used to
configure this operation.
Note:

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.
26.14.1.2

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
User's Manual
The ini file parameter IsWaitForDialTone must be disabled for this mode.
Figure ‎ 2 6-8: Call Flow for Two-Stage Dialing
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Mediant 800B GW & E-SBC
Document #: LTRT-10274