preemption of E911 IP-to-Tel calls when there are unavailable or
busy channels. In this scenario, the device terminates one of the
busy channels and sends the emergency call to this channel.
This feature is enabled by setting the CallPriorityMode
parameter to 2 (“Emergency”). For a description of this feature,
see 'Pre-empting Existing Call for E911 IP-to-Tel Call' on page
256.
The list can include up to four different numbers, where each
number can be up to four digits long.
Example: EmergencyNumbers = ‘100’,’911’,’112’
Web: Emergency Calls Regret
Timeout
EMS: Emergency Regret Timeout
[EmergencyRegretTimeout]
Defines the time (in minutes) that the device waits before
tearing-down an emergency call (defined by the parameter
EmergencyNumbers). Until this time expires, an emergency call
can only be disconnected by the remote party, typically, by a
Public Safety Answering Point (PSAP).
The valid range is 1 to 30. The default value is 10.
Note: This parameter is applicable only to FXS interfaces.
Multilevel Precedence and Preemption (MLPP) Parameters
Web: MLPP DiffServ
EMS: Diff Serv
[MLPPDiffserv]
Defines the DiffServ value (differentiated services code
point/DSCP) used in IP packets containing SIP messages that
are related to MLPP calls. This parameter defines DiffServ for
incoming MLPP calls with the Resource-Priority header.
The valid range is 0 to 63. The default value is 50.
Notes:
The same value must be configured for this parameter and
the parameter PremiumServiceClassControlDiffServ.
Outgoing calls are tagged according to the parameter
PremiumServiceClassControlDiffServ.
Web/EMS: Precedence Ringing
Type
[PrecedenceRingingType]
Defines the index of the Precedence Ringing tone in the Call
Progress Tones (CPT) file. This tone is used when the
parameter CallPriorityMode is set to 1 and a Precedence call is
received from the IP side.
The valid range is -1 to 16. The default value is -1 (i.e., plays
standard ringing tone).
EMS: E911 MLPP Behavior
[E911MLPPBehavior]
Defines the E911 (or Emergency Telecommunication
Services/ETS) MLPP Preemption mode:
[0] = (Default) Standard Mode - ETS calls have the highest
priority and preempt any MLPP call.
[1] = Treat as routine mode - ETS calls are handled as
routine calls.
[RPRequired]
Determines whether the SIP resource-priority tag is added in the
SIP Require header of the INVITE message for Tel-to-IP calls.
[0] Disable = Excludes the SIP resource-priority tag from the
SIP Require header.
[1] Enable = (Default) Adds the SIP resource-priority tag in
the SIP Require header.
Note: This parameter is applicable only to MLPP priority call
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