Version 6.4 737 March 2012
SIP User's Manual A. Configuration Parameters Reference
Parameter Description
[2] Ascending = Selects the lowest available channel in the
Trunk Group and if unavailable, selects the next higher channel.
[3] Cyclic Descending = Selects the next available channel in
descending cyclic order. It always selects the next lower
channel number in the Trunk Group. When the device reaches
the lowest channel number in the Trunk Group, it selects the
highest channel number in the Trunk Group and then starts
descending again.
[4] Descending = Selects the highest available channel in the
Trunk Group and if unavailable, selects the next lower channel.
[5] Dest Number + Cyclic Ascending = The device first selects
the channel according to the called number. If the called number
isn't found, it then selects the next available channel in
ascending cyclic order.
Note: If the called number is located but the port associated
with the number is busy, the call is released.
[6] By Source Phone Number = The device selects the channel
according to the calling number.
[7] Trunk Cyclic Ascending = The device selects the channel
from the first channel of the next trunk (adjacent to the trunk
from which the previous channel was allocated). This option is
applicable only to digital interfaces.
[8] Trunk & Channel Cyclic Ascending = The device implements
the Trunk Cyclic Ascending and Cyclic Ascending methods to
select the channel. This method selects the next physical trunk
(pertaining to the Trunk Group) and then selects the B-channel
of this trunk according to the cyclic ascending method (i.e.,
selects the channel after the last allocated channel). This option
is applicable only to digital interfaces.
For example, if the Trunk Group includes two physical trunks, 0
and 1:
For the first incoming call, the first channel of Trunk 0 is
allocated.
For the second incoming call, the first channel of Trunk 1 is
allocated.
For the third incoming call, the second channel of Trunk 0 is
allocated.
[9] Ring to Hunt Group = The device allocates IP-to-Tel calls to
all the FXS ports (channels) pertaining to a specific Hunt Group.
When a call is received for a specific Hunt Group, all telephones
connected to the FXS ports belonging to the Hunt Group start
ringing. The call is eventually received by whichever telephone
answers the call first (afterwhich the other phones stop ringing).
This option is applicable only to FXS interfaces.
[10] Select Trunk by ISDN SuppServ Table = The device
selects the BRI port/module according to the settings in the
ISDN Supplementary Services table (defined by the
ISDNSuppServ parameter), allowing the routing of IP-to-Tel
calls to specific BRI endpoints.
[11] Dest Number + Ascending = The device allocates a
channels to incoming IP-to-Tel calls as follows:
a. The device attempts to route the call to the channel that is
associated with the destination (called) number. If located,
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