3Com VCX v7111 User Manual page 65

Protocol Definition, General Parameters
Table 18
Parameter
PRACK Mode
[PRACKMode]
Channel Select Mode
[ ChannelSelectMode ]
®
3Com VCX V7111 VoIP Gateway User Guide
Description
PRACK mechanism mode for 1xx reliable responses:
Disable [0] .
Supported [1] (default).
Required [2] .
The Supported and Required headers contain the
100rel parameter.
V7111 sends PRACK message if 180/183 response is
received with 100rel in the Supported or the Required
headers.
Port allocation algorithm for IP to Tel calls.
You can select one of the following methods:
By Dest Phone Number [0] = Select the gateway port according to
the called number (called number is defined in the Endpoint Phone
Number table).
Cyclic Ascending [1] = Select the next available channel in an
ascending cycle order. Always select the next higher channel number
in the hunt group. When the gateway reaches the highest channel
number in the hunt group, it selects the lowest channel number in the
hunt group and then starts ascending again.
Ascending [2] = Select the lowest available channel. Always start at
the lowest channel number in the hunt group and if that channel is
not available, select the next higher channel.
Cyclic Descending [3] = Select the next available channel in
descending cycle order. Always select the next lower channel
number in the hunt group. When the gateway reaches the lowest
channel number in the hunt group, it selects the highest channel
number in the hunt group and then starts descending again.
Descending [4] = Select the highest available channel. Always start
at the highest channel number in the hunt group and if that channel is
not available, select the next lower channel.
Dest Number + Cyclic Ascending [5] = First select the gateway port
according to the called number (called number is defined in the
Endpoint Phone Number table). If the called number is not found,
then select the next available channel in ascending cyclic order. Note
that if the called number is found, but the port associated with this
number is busy, the call is released.
By Source Phone Number [6] = Select the gateway port according to
the calling number.
The default method is By Phone Number.
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