User's Manual 67. Configuration Parameters Reference
Version 6.8 923 Mediant 500L MSBR
Parameter Description
 [1] Enable = The FXS endpoint makes the first and second
calls on different RTP ports in the initial outgoing INVITE
request. If a three-way conference is then made, the device
sends a re-INVITE to the held call to retrieve it, without
changing the port of the held call.
For example: A first calls B on port 6000 and places B on
hold. A then calls C on port 6010. The device sends a re-
INVITE to the held call to retrieve it (without changing the port,
i.e., remains 6010).
Notes:
 When this feature is enabled and only one RTP port is
available, only one call can be made by the FXS endpoint, as
there is no free RTP port for a second call.
 When this feature is enabled and you are using the Call
Forking feature, every forked call is sent with a different RTP
port. As the device can fork a call to up to 10 destinations, the
device requires at least 10 free RTP ports.
 This parameter is applicable only to FXS interfaces.
67.10.5.9 MLPP and Emergency Call Parameters
The Multilevel Precedence and Preemption (MLPP) and emergency E911 call parameters
are described in the table below.
Table 67-50: 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
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