Two-Stage Dialing - AudioCodes Mediant 1000B User Manual

User's Manual

Waiting for Dial Tone: Enables the device to dial the digits to the Tel side only after
detecting a dial tone from the PBX line. The ini file parameter IsWaitForDialTone is
used to configure this operation.

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.
27.13.1.2

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.
Version 7.0
The ini file parameter IsWaitForDialTone must be disabled for this mode.
Figure 27-10: Call Flow for Two-Stage Dialing
571 Mediant 1000B Gateway and E- SBC
27. Analog Gateway