Hide Caller Id - Cisco C926 User Manual

2. Change the Tone Time as you want (for example 3s)

Hide Caller ID

Just enable the unknown/hidden caller feature, by enabling Anonymous call feature thereby the receiver won't be able to know who is calling
them.
To configure anonymous call
1. Press Menu Features Anonymous Call Account ID 1
2. Press and to select the enable choice in Anonymous Call filed.
3. Enter the Call On Code (optional), Call Off Code (optional).
4. Press or Save soft key to save the configuration.
To cancel anonymous call feature
1. Press Menu Features Anonymous Call
2. Press and key to select the disable choice in Anonymous Call filed.
3. Press or Save soft key to save the configuration.