User`s manual

SIP User's Manual 136 Document #: LTRT-83303
Mediant 1000 & Mediant 600
Parameter Description
Channel Select Mode
[ChannelSelectMode]
Port (channel) allocation algorithm for IP-to-Tel calls.
 [0] By Dest Phone Number = Selects the device's channel according to
the called number (defined in the 'Endpoint Phone Number' table --
Configuring the Endpoint Phone Numbers). (default.)
 [1] Cyclic Ascending = Selects the next available channel in an
ascending cyclic order. Always selects the next higher channel number
in the trunk group. When the device reaches the highest channel
number in the trunk group, it selects the lowest channel number in the
trunk group and then starts ascending again.
 [2] Ascending = Selects the lowest available channel. It always starts at
the lowest channel number in the trunk group and if that channel is not
available, selects the next higher channel.
 [3] Cyclic Descending = Selects the next available channel in
descending cyclic order. Always selects the next lower channel number
in the trunk group. When the device 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 = Selects the highest available channel. Always starts
at the highest channel number in the trunk group and if that channel is
not available, selects the next lower channel.
 [5] Dest Number + Cyclic Ascending = First selects the device's port
according to the called number. If the called number isn't found, it then
selects 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 = Selects the device's channel according
to the calling number.
 [7] Trunk Cyclic Ascending = Digital: Selects the device's port from the
first channel of the next trunk (next to the trunk from which the previous
channel was allocated. Not applicable for Mediant 1000 analog.
Notes:
 The internal numbers of the device's B-channels are defined by the
TrunkGroup parameter.
 For defining the channel select mode per Trunk Group, refer to
''Configuring the Trunk Group Settings'' on page 228.
Enable Early Media
[EnableEarlyMedia]
Enables the device to send a 183 Session Progress response with SDP
(instead of 180 Ringing), allowing the media stream to be established prior
to the answering of the call.
 [0] Disable = Early Media is disabled (default).
 [1] Enable = Enables Early Media.
For Mediant 1000 Analog interface: Note that to send a 183 response, you
must also set the parameter ProgressIndicator2IP to 1. If it is equal to 0,
180 Ringing response is sent.
For Digital interface: Sending a 183 response depends on the Progress
Indicator (PI). It is sent only if PI is set to 1 or 8 are received in Proceeding
or Alert PRI messages. For CAS devices, see the ProgressIndicator2IP
parameter.