SIP User's Manual 502 Document #: LTRT-12801
MP-500 MSBG
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.
îš„ 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).
9.7.1.2 Two-Stage Dialing
Two-stage dialing is when the IP caller is required to dial twice. The caller initially dials to
the FXO device and only after receiving a dial tone from the PBX (via the FXO device),
dials the destination telephone number.
Figure 9-34: Call Flow for Two-Stage Dialing
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