How to enable or disable call waiting manually.
Cisco, Panasonic, Polycom, VOD, VOM, Yealink.
- Dial 555, when prompted enter your voicemail password followed by the # key.
- Press * to return to the main menu.
- Press 3 for user preference.
- Press 3 for call waiting handling.
- Press 1 for toggling it, that is to enable/disable it.