To create "Broadcast" huntgroups where all phones in the group ring at the same time you need to use Overlay-DN's.
This is covered in the Secondary Call Coverage section of the Admin guide, under ephone-dn Overlays.
An ephone-dn overlay allows more than one ephone-dn to share the same physical line button on an IP
phone. Overlaid ephone-dns can be used to receive incoming calls and place outgoing calls.
Ephone-dn overlays can use ephone-dns with the same number or different numbers. The order in which
ephone-dns are used by incoming calls can be determined by the ephone-dns’ preference configurations.
For example, ephone-dn 1 through ephone-dn 4 have the same number of 1001, and three phones are
configured with the button 1o1,2,3,4 command. A call to 1001 will ring on the ephone-dn with the
highest preference and display the caller ID on all phones that are on hook. If another incoming call to
1001 is placed while the first call is active (and the first ephone-dn with the highest preference is
configured with the no huntstop command), the call will roll over to the ephone-dn with the next-highest
preference, and so forth. If the ephone-dns in an ephone-dn overlay use different numbers, incoming
calls will go to these numbers’ ephone-dns with highest preferences.
Example
ephone-dn 1
number 1001
no huntstop
preference 0
ephone-dn 2
number 1001
no huntstop
preference 1
ephone-dn 3
number 1001
huntstop
preference 2
ephone 10
button 1o1,2,3
ephone 11
button 1o1,2,3
ephone 12
button 1o1,2,3
