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SIP User's Manual 8. Telephony Capabilities
Version 5.0 223 December 2006
8.4 FXO Operating Modes
This section provides a description of the FXO operating modes and gateway
configurations for Tel-to-IP and IP-to-Tel calls.
8.4.1 IP-to-Telephone Calls
The FXO gateway provides the following FXO operating modes for IP-to-Tel calls:
One-stage dialing
Waiting for dial tone
Time to wait before dialing
Answer supervision
Two-stage dialing
Dialing time
Disconnect supervision
DID wink
8.4.1.1 One-Stage Dialing
One-stage dialing is when the FXO gateway receives an IP-to-Tel call, off-hooks the PBX
line connected to the telephone, and then immediately dials the destination telephone
number. In other words, the IP caller doesn't dial the PSTN number upon hearing a dial
tone.
Figure 8-1: Call Flow for One-Stage Dialing
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