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Chapter 40

Cisco IP Phones

Shared Line Restrictions

•

OL-7135-01

devices. For N number of devices sharing the same line, both Maximum Calls

setting and Busy Trigger setting must be set to N. This allows each shared line

user to receive at least one call.

The shared line phone should not interact with the call that it does not receive

(because the Line Control does not maintain call information). So, a newly

registered device will not recognize any existing calls on that line. The newly

registered device cannot resume any held call if the call started before this

device was registered with the Line Control. For example, A and A' share the

same line, A is powered down (or logged out for the extension mobility user),

and A's receives an active call. After phone A is on and it registers with

Cisco CallManager, A should not see the existing active call in this line.

If shared line phones' calls should interact with each other, Cisco

recommends that you set the maximum number of calls for all shared lines

MCID devices to 2*N, where N is the number of shared line devices.

Do not use shared lines for Cisco CallManager Attendant Console pilot points

or hunt group members. The phone that acts as the attendant console supports

shared lines.

Do not use shared line appearances on any Cisco IP Phone that requires

auto-answer capability and do not turn on auto answer for a shared line

appearance.

Do not configure shared line appearances on the primary lines of the phones;

for example, if two phones have a shared line appearance, only one of the

phones should have the primary line configured as shared (the other phone

should have the secondary line configured as shared).

Barge and Privacy work with shared lines only.

Cisco recommends that you do not configure shared lines for Cisco IP

Phones, H.323 clients, and MGCP POTS phones; likewise, Cisco

recommends that you do not configure shared lines for H.323 clients and

MGCP POTS phones. If you configure the same shared line appearance for a

H.323 client, a MGCP POTS phone, for example, NetMeeting, and a Cisco IP

Phone, you cannot use the hold/resume feature on the H.323 client or MGCP

POTS Phone.

Directory Numbers

Cisco CallManager System Guide

40-29