SIP User's Manual 278 Document #: LTRT-83310
Mediant 600 & Mediant 1000
Parameter Description
Forking Group 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 enabled, 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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