SIP User's Manual 672 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
Web/EMS: Emergency
Numbers
[EmergencyNumbers]
Defines a list of “emergency” numbers.
For FXS: When one of these numbers is dialed, the outgoing INVITE
message includes the SIP Priority and Resource-Priority headers. If
the user places the phone on-hook, the call is not disconnected.
Instead, a Hold Re-INVITE request is sent to the remote party. Only if
the remote party disconnects the call (i.e., a BYE is received) or a
timer expires (set by the EmergencyRegretTimeout parameter) is the
call terminated.
For FXO, CAS, and ISDN: 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 to 2
(“Emergency”). For a description of this feature, see 'Pre-empting
Existing Call for E911 IP-to-Tel Call' on page 313.
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.
A.12.5.9 Call Cut-Through Parameters
The call cut-through parameters are described in the table below.
Table A-49: Call Cut-Through Parameters
Parameter Description
Web: Enable Calls Cut
Through
EMS: Cut Through
[CutThrough]
Enables FXS endpoints to receive incoming IP calls while the port is in off-
hook state.
[0] Disable (default)
[1] Enable
If enabled, the FXS interface answers the call and 'cuts through' the voice
channel if there is no other active call on the port, even if the port is in off-
hook state.
When the call is terminated (by the remote IP party), the device plays a
reorder tone for a user-defined time (configured by the
CutThroughTimeForReorderTone parameter) and is then ready to answer
the next incoming call without on-hooking the phone.
The waiting call is automatically answered by the device when the current
call is terminated (configured by setting the parameter EnableCallWaiting
to 1).
Note: This feature is applicable only to FXS interfaces.
[DigitalCutThrough]
Enables PSTN CAS channels/endpoints to receive incoming IP calls even
if the B-channels are in off-hook state.
[0] Disabled (default)
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