Designed for use only on Cisco Webex Wireless Phone 800 series devices. The Push-to-talk (PTT) application provides radio multicast on Cisco devices. * Up to 25 Channels can be subscribed * Emergency Channel override * Priority Channel override * Transmit or listen only options for each channel * Programmable Caller ID * View recent PTT activity * Select default channel * Soft and hard transmit keys * Deployable in groups * Interfaces with Cisco Phone calling activity