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:
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:
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:
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:
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:
Configure partitions and calling search spaces before you add a translation pattern.
Configure translation patterns with different levels of display restrictions.
Check the Ignore Presentation Restriction (Internal Calls Only) check box for IP Phones such as lobby phones when you want to ensure that the call information display for internal calls is always visible.
Configure individual, associated translation patterns for each individual Call Park directory number to work with the Call Park feature.
Part I: Cisco CallManager Fundamentals
Introduction to Cisco Unified Communications and Cisco Unified CallManager
Cisco Unified CallManager Clustering and Deployment Options
Cisco Unified CallManager Installation and Upgrades
Part II: IPT Devices and Users
Cisco IP Phones and Other User Devices
Configuring Cisco Unified CallManager to Support IP Phones
Cisco IP Telephony Users
Cisco Bulk Administration Tool
Part III: IPT Network Integration and Route Plan
Cisco Catalyst Switches
Configuring Cisco Gateways and Trunks
Cisco Unified CallManager Route Plan Basics
Cisco Unified CallManager Advanced Route Plans
Configuring Hunt Groups and Call Coverage
Implementing Telephony Call Restrictions and Control
Implementing Multiple-Site Deployments
Part IV: VoIP Features
Configuring User Features, Part 1
Configuring User Features, Part 2
Configuring Cisco Unified CallManager Attendant Console
Configuring Cisco IP Manager Assistant
Part V: IPT Security
Securing the Windows Operating System
Securing Cisco Unified CallManager Administration
Preventing Toll Fraud
Hardening the IP Phone
Understanding Cryptographic Fundamentals
Understanding the Public Key Infrastructure
Understanding Cisco IP Telephony Authentication and Encryption Fundamentals
Configuring Cisco IP Telephony Authentication and Encryption
Part VI: IP Video
Introducing IP Video Telephony
Configuring Cisco VT Advantage
Part VII: IPT Management
Introducing Database Tools and Cisco Unified CallManager Serviceability
Configuring Alarms and Traces
Using Additional Management and Monitoring Tools
Part VIII: Appendix
Appendix A. Answers to Review Questions