Version 5.8 405 September 2009
SIP User's Manual 9. IP Telephony Capabilities
9.6.1.1 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 9-8: Call Flow for One-Stage Dialing
One-stage dialing incorporates the following FXO functionality:
îš„ 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.
îš„ 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: The ini file parameter IsWaitForDialTone must be disabled for this mode.
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