How to Configuring Caller ID Blocking in Call Manager Express?

Phone users can block caller-ID displays on calls from a particular ephone-dn, or you can selectively choose to block the name or number on outbound calls from a particular dial peer. The display of caller ID information for outgoing calls from a particular ephone-dn can be blocked on a per-call basis, allowing users to maintain their privacy when necessary. The system administrator defines a code for caller ID blocking in Cisco Unified CME. Users then dial the code before making any call on which they do not want their number displayed on the called-party phone. The caller ID is sent, but its presentation parameter is set to "restricted" so that the caller ID is not displayed. Blocking CLID displays for local calls from a particular extension tells the far-end gateway device to block display of calling-party information for the calls received from this ephone-dn. Alternatively, you can allow the local display of CLID information and independently block the CLID name or number on outbound VoIP calls. This configuration has the benefit of allowing caller-ID display for local calls while preventing caller-ID display for external calls going over VoIP. This feature can be used for PSTN calls that go out over ISDN.

Configure Caller ID Blocking for all outbond calls

Router# configure terminal

Router(config)# dial-peer voice 3 voip

Router(config-dial-peer)# clid strip

Router(config-dial-peer)# clid strip name

Router(config-dial-peer)# end

To define a code that phone users can dial to block caller ID display on selected outbound calls from a particular directory number or to block caller ID display on all calls from a directory number, perform the following steps.

Router# configure terminal

Router(config)# telephony-service

Router(config-telephony)# caller-id block code *1234

Router(config-telephony)# exit

Router(config)# ephone-dn 3

Router(config-ephone-dn)# caller-id block

Router(config-dial-peer)# end

Suggested Reading

How to Configure Ephones and Ephone-DNs in CME?

How to Configure Shared-Line and Overlay Options in CME?

How to Configuring a Voice Network Directory in CME?

How to Configuring a Call Forwarding from the IP Phone in CME?