Key System Groups and Multicall Groups let multiple telephones share the same extension number. Incoming calls ring all of the idle stations, and the stations stop ringing when one member answers the call. Only one member of a Key System Group can use the line at one time; a Multicall group allows simultaneous users.
When a member of a Key System Group answers a call, the line becomes busy (only one member can use the line at one time); however, when a member of a Multicall Group answers a call, the line becomes idle (all group members can use the line simultaneously).
When a member of a Key System Group places a call on Hold, the call can be retrieved by any member of the group. When a member of a Multicall Group places a call on Hold, the call can be retrieved only by the set that placed the call on Hold.
If a 2500, SUPERSET 401, SUPERSET 401+, SUPERSET 4001, 5001 IP Phone, or 5201 IP Phone is included in a Key System Group, it must be the prime member.
If a 2500 telephone is included in a Multicall group, it must be the prime number.
For the MXe Server, the maximum number of members per group is 250. For the other controllers, the maximum number of members per group is 32.
A DTS trunk can be a key line appearance (see Trunk Select - Direct). 2500, SUPERSET 401, SUPERSET 401+, and SUPERSET 4001 telephones cannot be included in the same Key System Group as a DTS line.
SUPERSET 401, SUPERSET 401+, SUPERSET 4001, 5001 IP, 5201 IP and ONS telephones that appear as key lines on multiline sets cannot obtain dial tone while a call is on Hold.
When a Personal Ring Group (PRG) member belongs to a Multicall group, the PRG is not busy until all Multicall appearances of the member are busy. And when a member of a Multicall Group answers a call, the line becomes idle because all group members can use the line simultaneously.
The following conditions apply to the Display Caller ID on Multicall/Keylines Timer:
It does not apply if the telephone is in ringing or dialing state.
The Caller ID is displayed for the configured duration or until the caller hangs up or is forwarded (whichever is shorter).
When lines are set as delay ring, the Caller ID may be displayed twice (once when the call comes in and once when the delay ring timer expires).
The 5560 IP Turret cannot be a member of a Multicall group even though it can be assigned a Multicall line key in the Multiline Set Keys form.
Complete the Single Line IP Sets form, Multiline IP Sets form, the Single Line DNI Sets form, the Multiline DNI Sets form, or the Analog Sets form for each set. Enter a prime directory number and an interconnect number.
For non-prime members, program a Key System or Multicall key in the Multiline Set Keys form. Complete the Directory Number (prime number) and Ring Type fields.
To display calling line identification for all calls on prime directory numbers and incoming calls on non-prime directory numbers, enable ANI/DNIS/ISDN Calling/Called Number or ANI/ISDN Calling Number Only in the Class of Service Options form for the telephone or console.
To display calling line identification for outgoing calls on non-prime directory numbers, complete the Display Caller ID on Multicall/Keylines in the Class of Service Options form for the telephone or console.
To define the length of time that the Calling Line ID is displayed when a call is waiting on a non-prime line, set the Display Caller ID on Multicall/Keylines Timer in the Class of Service Options form.
To allow any other set user in the same key system group to enter a conversation that is in progress on a key line, enable the Privacy Released option in the Class of Service of the set.
None.
