User`s manual

MP-1xx H.323 User’s Manual 5. Configuring the MP-1xx
Version 4.4 77 March 2005
5.8.4.3 IP to Hunt Group Routing Table
The IP to Hunt Group Routing Table is used to route incoming IP calls to groups of channels
called hunt groups. Calls are assigned to hunt groups according to any combination of the
following three options (or using each independently):
• Destination phone prefix
• Source phone prefix
• Source IP address
The call is then sent to the VoIP gateway channels assigned to that hunt group. The specific
channel, within a hunt group, that is assigned to accept the call is determined according to the
hunt group’s channel selection mode which is defined in the Hunt Group Settings table (Section
5.8.8.5 on page 97) or according to the global parameter ‘ChannelSelectMode’ (refer to Table 5-5
on page 58). Hunt groups can be used on both FXO and FXS gateways; however, usually they
are used with FXO gateways.
Note that when a Gatekeeper is used, before an incoming call is being routed to the relevant hunt
group an Admission request is sent to the Gatekeeper. Calls that aren’t authorized are dropped.
When the parameter ‘PreferRouteTable’ is set to 1, the gateway checks the 'Source IP Address'
field in the 'IP to Hunt Group Routing' table for a match with the incoming call. If such a match is
found, the call is routed. If a match is not found, an Admission request is sent to the Gatekeeper.
Note: When a release reason that is defined in the ‘Reasons for Alternative IP to Tel Routing’
table is received for a specific IPTel call, an alternative hunt group for that call is available. To
associate an alternative hunt group to an incoming IP call, assign it with an additional entry in the
‘IP to Hunt Group Routing’ table (repeat the same routing rules with a different hunt group ID).
For detailed information on the ‘Reasons for Alternative Routing Tables’ refer to Section
5.8.4.5
on page 80.
To use hunt groups you must also do the following:
• You must assign a hunt group ID to the VoIP gateway channels on the Endpoint Phone
Number screen. For information on how to assign a hunt group ID to a channel, refer to
Section
5.8.7 on page 90.
• You can configure the Hunt Group Settings table to determine the method in which new calls
are assigned to channels within the hunt groups (a different method for each hunt group can
be configured). For information on how to enable this option, refer to Section
5.8.8.5 on page
97. If a Channel Select Mode for a specific hunt group isn’t specified, then the global
"Channel Select Mode" parameter (defined in ‘General Parameters’ screen under ‘Advanced
Parameters’) applies.
 To configure the IP to Hunt Group Routing table, take these 6 steps:
1. Open the ‘IP to Hunt Group Routing’ screen (Protocol Management menu > Routing
Tables submenu > IP to Hunt Group Routing option); the ‘IP to Hunt Group Routing’ table
screen is displayed.
Figure
5-13: IP to Hunt Group Routing Table Screen