Version 6.2  835  February 2011 
SIP User's Manual   12. Configuration Parameters Reference 
 
Parameter  Description 
Web: Rings before 
Detecting Caller ID 
EMS: Rings Before Caller 
ID 
[RingsBeforeCallerID] 
Determines the number of rings before the device starts detecting 
Caller ID. 
  [0] 0 = Before first ring. 
  [1] 1 = After first ring (default). 
  [2] 2 = After second ring. 
Note: This parameter is applicable only to FXO interfaces. 
Web/EMS: Guard Time 
Between Calls 
[GuardTimeBetweenCalls] 
Defines the time interval (in seconds) after a call has ended and a new 
call can be accepted for IP-to-Tel (FXO) calls.  
The valid range is 0 to 10. The default value is 1. 
Notes: 
  Occasionally, after a call ends and on-hook is applied, a delay is 
required before placing a new call (and performing off-hook). This is 
necessary to prevent incorrect hook-flash detection or other glare 
phenomena. 
  This parameter is applicable only to FXO interfaces. 
 
 
12.12.12  FXS Parameters 
The general FXS parameters are described in the table below. 
Table  12-62: General FXS Parameters 
Parameter  Description 
Web: FXS Coefficient Type 
EMS: Country Coefficients 
[FXSCountryCoefficients] 
Determines the FXS line characteristics (AC and DC) according to USA 
or Europe (TBR21) standards. 
  [66] Europe = TBR21 
  [70] USA = United States (default) 
Note: For this parameter to take effect, a device reset is required.