Hi yulook,
You would need to take the Shared Support Line/DN 0009 and make
it a new Hunt Pilot DN. Then on the Level 1,2 & 3 phones you would put
a new DN on Line button 1. Shared lines like 0009 will always ring all
phones simultaneously in your current config.
In the Line Group that is associated with the new Shared Support Hunt
Pilot you can then set a Top Down algorithm that routes to Level 1, Level 2
and Level 3 DN Line Group members in the chosen order
Line Groups
Line groups contain one or more directory numbers. A distribution algorithm, such as Top Down, Circular, Longest Idle Time, or Broadcast, associates with a line group. Line groups also have an associated Ring No Answer reversion timeout value.
The following descriptions apply to the members of a line group:
An idle member designates one that is not serving any call.
An available member designates one that is serving an active call but can accept a new call(s).
A busy member cannot accept any calls.
For information on configuring line groups,
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_2_3/ccmcfg/b03lngrp.html
Hunt Lists
Hunt lists comprise ordered groupings of line groups. A line group may belong to more than one hunt list. Hunt pilots associate with hunt lists. A hunt list may associate with more than one hunt pilot.
For information on configuring hunt lists,
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_2_3/ccmcfg/b03htlst.html
Hunt Pilots ..this is what 0009 would become.
Hunt pilots are sets of digits. They comprise lists of route patterns that are used for hunting. A hunt pilot can specify a partition, numbering plan, route filter, and hunt forward settings. A hunt pilot must specify a hunt list.
For information on configuring hunt pilots,
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/4_2_3/ccmcfg/b03htpil.html
Cheers!
Rob
