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Version 5.4 407 May 2008
SIP User's Manual 7. IP Telephony Capabilities
Figure 7-1: Call Flow for One-Stage Dialing
One-stage dialing incorporates the following FXO functionality:
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.
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.
Answer Supervision: The Answer Supervision feature enables the FXO device to
determine when a call is connected, by using one of the following methods:
• Polarity Reversal: device sends a 200 OK in response to an INVITE only when it
detects a polarity reversal.
• Voice Detection: device sends a 200 OK in response to an INVITE only when it
detects the start of speech (or ringback tone) from the Tel side. (Note that the
IPM detectors must be enabled).