AudioCodes Mediapack mp-11x, User Manual

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SIP User's Manual 334 Document #: LTRT-65409
MediaPack Series
7.3.1.2 Two-Stage Dialing
Two-stage dialing is when the IP caller is required to dial twice. The caller initially dials to
the FXO gateway and only after receiving a dial tone from the PBX (via the FXO gateway)
dials the destination telephone number.
Figure 7-2: Call Flow for Two-Stage Dialing
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 will be.
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
7.3.1.3 Call Termination (Disconnect Supervision) on MediaPack/FXO
The FXO Disconnect Supervision enables the gateway's FXO ports to monitor call-
progress tones from a PBX or from the PSTN. This allows the FXO to determine when the
call has terminated on the PBX side, and thereby, prevents analog trunks (i.e., lines to the
PBX) from getting “stuck” when the called phone hangs up.