Call waiting feature allows the user to know if another call is ringing on the phone when the user is on a call. If the call waiting feature is turned off, then the incoming call does not ring the phone when the user is on a call and the caller hears a busy signal or a message.
This document explains how to activate or deactivate call waiting feature on the Cisco SPA 300 series IP Phone.
• SPA301
• SPA303
Step 1. To activate call waiting, enter *56.
Step 2. To deactivate call waiting, enter *57.
Step 1. Dial *71 followed by the phone number to activate call waiting for that call.
Step 2. Dial *72 followed by the phone number to deactivate call waiting for that call.