Version 6.6 229 MP-11x & MP-124
User's Manual 22. Routing
Parameter Description
Forking Group
[PREFIX_ForkingGroup]
Defines a forking group ID for the routing rule. This enables forking of
incoming Tel calls to two or more IP destinations. The device sends
simultaneous INVITE messages and handles multiple SIP dialogs
until one of the calls is answered. When a call is answered, the other
calls are dropped.
If all matched routing rules belong to the same Forking Group
number, the device sends an INVITE to all the destinations belonging
to this group and according to the following logic:
 If matched routing rules belong to different Forking Groups, the
device sends the call to the Forking Group of the first matched
routing rule. If the call cannot be established with any of the
destinations associated with this Forking Group and alternative
routing is en
abled, the device forks the call to the Forking Group of
the next matched routing rules as long as the Forking Group is
defined with a higher number than the previous Forking Group.
For example:
 Table index entries 1 and 2 are defined with Forking Group "1",
and index entries 3 and 4 with Forking Group "2": The device first
sends the call according to index entries 1 and 2, and if
unavailable and alternative routing is enabled, sends the call
according to index entries 3 and 4.
 Table index entry 1 is defined with Forking Group "2", and index
entries 2, 3, and 4 with Forking Group "1": The device sends the
call according to index entry 1 only and ignores the other index
entries even if the destination is unavailable and alternative routing
is enabled. This is because the subsequent index entries are
defined with a Forking Group number that is lower than that of
index entry 1.
 Table index entry 1 is defined with Forking Group "1", index entry
2 with Forking Group "2", and index entries 3 and 4 with Forking
Group "1": The device first sends the call according to index
entries 1, 3, and 4 (all belonging to Forking Group "1"), and if the
destination is unavailable and alternative routing is enabled, the
device sends the call according to index entry 2.
 Table index entry 1 is defined with Forking Group "1", index entry
2 with Forking Group "3", index entry 3 with Forking Group "2",
and index entry 4 with Forking Group "1": The device first sends
the call according to index entries 1 and 4 (all belonging to Forking
Group "1"), and if the destination is unavailable and alternative
routing is enabled, the device sends the call according to index
entry 2 (Forking Group "3"). Even if index entry 2 is unavailable
and alternative routing is enabled, the device ignores index entry 3
because it belongs to a Forking Group that is lower than index
entry 2.
Notes:
 To enable Tel-to-IP call forking, you must set the 'Tel2IP Call
Forking Mode' (Tel2IPCallForkingMode) parameter to Enable.
 You can implement Forking Groups when the destination is an
LDAP server or a domain name using DNS. In such scenarios, the
INVITE is sent to all the queried LDAP or resolved IP addresses
respectively. You can also use LDAP routing rules with standard
routing rules for Forking Groups.
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