AudioCodes Mediant 500 E-SBC, User Manual

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User's Manual 54. Configuration Parameters Reference
Version 6.8 813 Mediant 500 E-SBC
Parameter Description

[1] Enable = Upon receipt of a REFER message, the
device forwards the REFER message and all relevant SIP
messages from and to the transferor, to the target
destination during call transfer. For consultation call
transfer, the REFER message contains a 'replaces'
parameter in the Refer-To header. In this case, the
outgoing REFER also contains a 'replaces' parameter in
the Refer-To header.
Note: This parameter is applicable to blind and consultation
call transfers.
54.10.5.6 MLPP and Emergency Call Parameters
The Multilevel Precedence and Preemption (MLPP) and emergency E911 call parameters
are described in the table below.
Table 54-46: MLPP and Emergency E911 Call Parameters
Parameter Description
Web/EMS: Call Priority Mode
CLI: call-prio-mode
[CallPriorityMode]
Defines priority call handling, for all calls.

[0] Disable (default).

[1] MLPP = MLPP Priority Call handling is enabled. MLPP
prioritizes call handling whereby the relative importance of
various kinds of communications is strictly defined, allowing
higher precedence communication at the expense of lower
precedence communications. Higher priority calls override
less priority calls when, for example, congestion occurs in a
network.

[2] 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 that 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
other than By Dest Phone Number (0). The preemption 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.
Notes:

This parameter is applicable to CAS and ISDN.

MLPP and Emergency services can also be configured in a
Tel Profile.

For more information, see ''Pre-empting Existing Call for
E911 IP-to-Tel Call'' on page
418 .