Version 5.8 501 October 2009
SIP User's Manual 9. IP Telephony Capabilities
9.7 FXO Operating Modes
This section provides a description of the device's FXO operating modes:
IP-to-Tel calls (refer to ''FXO Operations for IP-to-Tel Calls'' on page 501)
Tel-to-IP calls (refer to ''FXO Operation
s for Tel-to-IP Calls'' on page 503)
9.7.1 FXO Operations for IP-to-Tel Calls
The FXO device provides the following operating modes for IP-to-Tel calls:
One-stage dialing (refer to ''One-Stage Dialing'' on page 501)
• Waiting for di
al tone ''Two-Stage Dialing'' on page 502
• Time to wait before di
aling
• Answer supervision
Two-stage dialing (refer to ''Two-Stage Dialing'' on page 502)
Dialing time
• Disconnect supervision (refer to ''Call Termination (Disconnect Supervision) on
FXO Devices'' on page 506)
• DID wi
nk (refer to ''DID Wink'' on page 503)
9.7.1.1 One-Stage Dialing
One-stage dialing is when the FXO device 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 9-33: Call Flow for One-Stage Dialing
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