If an application requires that hunting be implemented at the CPE, tiered ring-groups can be used in AOS IPBGs to act as a hunt group.
Only an analog (FXS) user can be configured as a member of a ring-group. SIP users and proxy users cannot be members of a ring-group. Likewise, TDM trunks cannot be a member of a ring-group. Each ring-group can contain only 1 member.
The hunting feature is only applicable for calls inbound from the SIP network. If the member assigned to the first ring-group is busy, or if the configured number of rings occurs before answer, the call will roll to the next ring-group defined by the ‘coverage internal <extension>’ command. Note: The call flow always adheres to the coverage defined in the original, called ring-group.
There are 3 steps to implementing hunt groups in AOS IPBGs.
1. Set the system forward-mode to ‘local’. This is a global configuration command:
(config)# voice forward-mode local
2. Configure a dial-plan entry for the ring-group extension(s) and used the default named digit timeout. This is a global configuration command: