Version 6.2 471 February 2011
SIP User's Manual 10. Configuration Parameters Reference
10.12.9 General FXO Parameters
The general FXO parameters are described in the table below.
Table 10-57: General FXO Parameters
Parameter Description
Web: FXO Coefficient Type
EMS: Country Coefficients
[CountryCoefficients]
Determines the FXO line characteristics (AC and DC) according to USA
or TBR21 standard.
 [66] Europe = TBR21
 [70] USA = United States (default)
Note: For this parameter to take effect, a device reset is required.
[FXONumberOfRings]
Defines the number of rings before the device's FXO interface answers
a call by seizing the line.
The valid range is 0 to 10. The default is 0.
When set to 0, the FXO seizes the line after one ring. When set to 1,
the FXO seizes the line after two rings.
Notes:
 This parameter is applicable only if automatic dialing is not used.
 If caller ID is enabled and if the number of rings defined by the
parameter RingsBeforeCallerID is greater than the number of rings
defined by this parameter, the greater value is used.
Web/EMS: Dialing Mode
[IsTwoStageDial]
Determines the dialing mode for IP-to-Tel (FXO) calls.
 [0] One Stage = One-stage dialing. In this mode, the device seizes
one of the available lines (according to the ChannelSelectMode
parameter), and then dials the destination phone number received in
the INVITE message. To specify whether the dialing must start after
detection of the dial tone or immediately after seizing the line, use
the IsWaitForDialTone parameter.
 [1] Two Stages = Two-stage dialing (default). In this mode, the
device seizes one of the PSTN/PBX lines without performing any
dialing, connects the remote IP user to the PSTN/PBX, and all
further signaling (dialing and Call Progress Tones) is performed
directly with the PBX without the device's intervention.
Notes:
 This parameter is applicable only to FXO interfaces.
 This parameter can also be configured per Tel Profile, using the
TelProfile parameter.
Web/EMS: Waiting For Dial
Tone
[IsWaitForDialTone]
Determines whether the device waits for a dial tone before dialing the
phone number for IP-to-Tel (FXO) calls.
 [0] No = Don't wait for dial tone.
 [1] Yes = Wait for dial tone (default).
When one-stage dialing and this parameter are enabled, the device
dials the phone number (to the PSTN/PBX line) only after it detects a
dial tone.
If this parameter is disabled, the device immediately dials the phone
number after seizing the PSTN/PBX line without 'listening' for a dial
tone.
Notes:
 The correct dial tone parameters must be configured in the CPT file.
 The device may take 1 to 3 seconds to detect a dial tone (according
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