A computer implemented method, computer program product and system are provided for implementing calling card security. A telephone call request is received from a calling card user. A plurality of predefined options is checked to identify user selected options for the calling card. The telephone call request from the calling card user is processed responsive to the identified user selected options for the calling card. During calling card setup, the calling card user can selectively enable multiple predefined options for use of the calling card. The calling card user can selectively enable use of the calling card for one or more user specified telephone numbers, use of the calling card to a user specified limited area, use of the calling card with voice recognition, use of the calling card for a user specified limited number of calls from a specified telephone number; and use of the calling card for a user specified limited time duration for a call.

 
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< Method and apparatus for implementing a bandlimited ringing signal for telephone networks

> Small array microphone for acoustic echo cancellation and noise suppression

> Pocket speakerphone

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