Version 6.6 607 October 2014
Installation & Operation Manual 40. General SIP Configuration
Parameter
Name
Type
Provisioning
Type
Description
Emergency
Numbers
Instant Defines a list of Emergency numbers.
These emergency numbers are used for the
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 (see below) to 2
(Emergency). The list can include up to four
different numbers, where each number can
be up to four digits long.
Example: EmergencyNumbers
=100,911,102,101.
Emergency
Special Release
Cause
Enum
Disable,Enable
Instant When an emergency number is detected,
the 4xx release causes should be converted
to "Service Unavailable" (503).
Call Priority
Mode
Enum
Disable,
Emergency
Instant Enables priority calls handling.
Disable = Disable (default).
Emergency = Preemption of IP-to-Tel E911
emergency calls. If the device receives an
E911 call and there are unavailable
channels to receive the call, the device
terminates one of the channel calls and
sends the E911 call to this channel. The
preemption is done only on a channel
pertaining to the same Trunk Group for
which the E911 call was initially destined
and if the channel select mode (configured
by the ChannelSelectMode parameter) is set
to a value other than “By Dest Number” (0).
The pre-emption is done only if the incoming
IP-to-Tel call is identified as an emergency
call. The device identifies emergency calls
by one of the following:
The destination number of the IP call
matches one of the numbers defined by the
EmergencyNumbers parameter. (For E911,
you must define this parameter with the
value "911".)
The incoming SIP INVITE message contains
the “emergency” value in the Priority header.
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