Dialing From Remote Extension (Phone At Fxs) - AudioCodes MediaPack MP-124 User Manual

The following is required:
One FXO device with ports connected directly to the PBX lines (shown in the figure
below)
One FXS device for the 'remote PBX extension'
Analog phones (POTS)
PBX (one or more PBX loop start lines)
LAN network
Figure 7-9: FXO-FXS Remote PBX Extension (Example)

7.12.4.1 Dialing from Remote Extension (Phone at FXS)

The procedure below describes how to dial from the 'remote PBX extension' (i.e., phone
connected to the FXS device).
To make a call from the FXS device, take these 3 steps:
1. Off-hook the phone and wait for the dial tone from the PBX. This is as if the phone is
connected directly to the PBX. The FXS and FXO devices establish a voice path
connection from the phone to the PBX immediately after the phone is off-hooked.
2. Dial the destination number (e.g., phone number 201). The DTMF digits are sent over
IP directly to the PBX. All the audible tones are generated from the PBX (such as
ringback, busy, or fast busy tones). One-to-one mapping occurs between the FXS
ports and PBX lines.
3. The call disconnects when the phone connected to the FXS goes on-hook.
SIP User's Manual 344
MediaPack Series
Document #: LTRT-65410