Call Display Restrictions

The Call Display Restrictions feature allows you to selectively display or restrict the calling and connected (called party) line information. A hotel environment frequently requires this functionality and might have the following needs:

• For calls between a guest room and the front desk, both the room and the front desk should see both the calling-party information and the called-party information.
• For calls between guest rooms, the rooms should not see the call information of other rooms displayed.
• For calls between guest rooms and other hotel extensions (such as a clubhouse), only the rooms should see the call information displayed.
• For external calls from the public switched telephone network (PSTN) to the front desk or guest rooms, the call information of the caller should not be displayed if the display settings are restricted.
• For all calls to the front desk, the call information of internal calls should be displayed.

In Cisco CallManager Release 4.0 and later, the calling-party and connected-party presentation can be controlled by the configuration at the translation pattern level. Starting with Cisco CallManager Release 4.1, this functionality was extended by adding a new setting at the device level that enables the device to ignore the caller ID restrictions of the other party for internal calls.

Understanding Calling Line ID Presentation

Cisco CallManager uses the Calling Line ID Presentation field information as a supplementary service to allow or restrict display of the telephone number of the originating caller on a call-by-call basis. Choose one of the following options to allow or restrict the display of the telephone number of the calling party on the IP Phone display of the called party for this translation pattern, shown in Figure 17-16:

• Default This option does not change the presentation of the calling-party identification information.
• Allowed Cisco CallManager allows the display of the calling-party name or number.
• Restricted Cisco CallManager blocks the display of the calling-party name or number.

Figure 17-16. Calling Line ID Presentation Restrictions in Translation Patterns

If the incoming call goes through a translation pattern or route pattern and the Calling Line ID Presentation setting is allowed or restricted, the system modifies the calling-line presentation with the translation or route pattern setting.

Understanding Connected Line ID Presentation

Cisco CallManager uses the Connected Line ID Presentation field information as a supplementary service to allow or restrict the display of the telephone number of the called party on a per-call basis. Choose one of the following options to allow or restrict the display of the telephone number of the connected party on the telephone of the calling party for this translation pattern, as shown in Figure 17-16:

• Default This option does not change the presentation of the connected-line identification information.
• Allowed Cisco CallManager allows the display of the connected-party name or number.
• Restricted Cisco CallManager blocks the display of the connected-party name or number.

If the incoming call goes through a translation or route pattern and the Connected Line ID Presentation field is set to Allowed or Restricted, the system modifies the connected-line presentation indicator with the translation or route pattern setting.

Understanding Ignore Presentation Indicators

The Ignore Presentation Indicators check box, introduced in CallManager 4.1, gives you the flexibility to overrule internal caller ID restrictions on a device-by-device basis. To activate this check box, access the IP Phone where you want to remove caller ID restrictions and place a check in the Ignore Presentation Indicators (Internal Calls Only) check box, shown in Figure 17-17. When this feature is active, the following caller ID modifications take place:

• Cisco CallManager always displays the call information of the remote party if the other party is internal, regardless of the other calling- and called-party presentation settings.
• Cisco CallManager does not display the call information of the remote party if the other party is external and the display presentation is restricted.

Figure 17-17. Setting Ignore Presentation Indicators Option for Select Devices

Configuring Caller ID Restrictions

Because each IPT environment can be so different, it is impossible to create exact caller ID restriction steps that apply to all organizations. Instead, complete the following general steps if you want to use Call Display Restrictions: