SIP User's Manual 74 Document #: LTRT-68806
Mediant 2000 & TP-1610 & TP-260/UNI
Table 5-8: General Parameters (Protocol Definition)
Parameter Description
Channel Select Mode
[ChannelSelectMode]
Port allocation algorithm for IP-to-Tel calls.
You can select one of the following methods:
 [0] By Dest Phone Number = (default) Select the gateway
port according to the called number.
 [1] Cyclic Ascending = Select the next available channel
in an ascending cycle order. Always select the next higher
channel number in the trunk group. When the gateway
reaches the highest channel number in the trunkgroup, it
selects the lowest channel number in the trunkgroup and
then starts ascending again.
 [2] Ascending = Select the lowest available channel.
Always start at the lowest channel number in the trunk
group and if that channel is not available, select the next
higher channel.
 [3] Cyclic Descending = Select the next available channel
in descending cycle order. Always select the next lower
channel number in the trunk group. When the gateway
reaches the lowest channel number in the hunt group, it
selects the highest channel number in the trunk group and
then starts descending again.
 [4] Descending = Select the highest available channel.
Always start at the highest channel number in the trunk
group and if that channel is not available, select the next
lower channel.
 [5] Dest Number + Cyclic Ascending = First select the
gateway port according to the called number. If the called
number isn't 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.
 [6] By Source Phone Number = Select the gateway port
according to the calling number.
 [7] Trunk Cyclic Ascending = Select the gateway port from
the first channel of the next trunk (next to the trunk from
which the previous channel was allocated.
Note: The internal numbers of the gateway's B-channels are
defined by the TrunkGroup parameter.
Enable Early Media
[EnableEarlyMedia]
If enabled, the gateway sends 183 Session Progress
response with SDP (instead of 180 Ringing), allowing the
media stream to be set up prior to the answering of the call.
 [0] Disable = Early Media is disabled (default).
 [1] Enable = Enables Early Media.
Sending a 183 response depends on the Progress Indicator.
It is sent only if PI = 1 or PI = 8 is received in Proceeding or
Alert PRI messages. For CAS gateways, see the
ProgressIndicator2IP parameter.
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