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Caller ID blocking on outbound calls does not apply to PSTN calls through foreign exchange office (FXO) ports. Caller ID features on FXO-connected subscriber lines are under the control of the PSTN service provider, who may require you to subscribe to their caller ID blocking service.
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.
To block the CLID name or number on outbound VoIP calls from a particular dial peer, perform the following steps.
 Restriction |
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| Command or Action | Purpose | |||
|---|---|---|---|---|
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Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
dial-peer voice tag [ pots | voip] Example: |
Enters dial-peer configuration mode.
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Step 4 |
clid strip Example: |
(Optional) Removes the calling-party number from the CLID information being sent with VoIP calls. |
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Step 5 |
clid strip name Example: |
(Optional) Removes the calling-party name from the CLID information being sent with VoIP calls. |
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Step 6 |
end Example: |
Returns to privileged EXEC mode. |
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.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
telephony-service Example: |
Enters telephony-service configuration mode. |
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Step 4 |
caller-id block code code-string Example: |
(Optional) Defines a code that users can enter before making calls on which the caller ID should not be displayed.
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Step 5 |
exit Example: |
Exits telephony-service configuration mode. |
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Step 6 |
ephone-dn dn-tag Example: |
Enters ephone-dn configuration mode. |
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Step 7 |
caller-id block Example: |
(Optional) Blocks display of caller-ID information for all outbound calls that originate from this directory number. This command can also be configured in ephone-dn-template configuration mode and applied to one or more directory number. The ephone-dn configuration has priority over the ephone-dn-template configuration. |
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Step 8 |
end Example: |
Returns to privileged EXEC mode. |
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Use the show running-config command to display caller ID blocking parameters, which may appear in the telephony-service, ephone-dn, or dial-peer portions of the output. Example: |
The following example defines a code of *1234 for phone users to enter to block caller ID on their outgoing calls:
telephony-service
caller-id block code *1234
The following example sets CLID blocking for the ephone-dn with tag 3.
ephone-dn 3
number 2345
caller-id blockThe following example blocks the display of CLID name and number on VoIP calls but allows CLID display for local calls:
ephone-dn 3
number 2345
dial-peer voice 2 voip
clid strip
clid strip nameThe following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to https://cfnng.cisco.com/. An account on Cisco.com is not required.|
Feature Name |
Cisco Unified CME Version |
Feature Information |
|---|---|---|
|
Caller ID Blocking |
3.0 |
Caller ID blocking per local call was introduced. |
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1.0 |
Caller ID blocking for outbound calls was introduced. |
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