With the Multicast Paging feature, the user can transmit a one-way RTP voice message to a group of phones within the same network.

The Multicast Paging group is defined by setting specific multicast IP address and port. The list of groups can be configured for every phone in the network, and a priority level can be defined for each outgoing group. Outgoing and incoming multicast page groups are configured separately so that the list of senders and recipients can vary.

An incoming multicast page is played on the phone speaker. The Phone screen displays a message box with the notification of an incoming multicast page during the transmission.

A multicast page can be sent to the configured groups either from the Features menu or, if the corresponding key is added, from the Phone screen. The user can add, move or delete the Multicast Paging keys from the Phone screen customization menu. During an outgoing transmission, the phone does not display any incoming calls but shows a message box indicating there is an outgoing multicast page. The user can activate any available audio device to send a page. The transmission is handled in a way similar to the outgoing call procedure.

If there is an incoming multicast page transmission with a higher priority, all other transmissions, including lower-priority pages and incoming calls, are ignored. Active calls have the priority level 3 and are put on hold when a multicast page with a higher priority is transmitted.

The Multicast Paging can be configured in either of the following ways:

Multicast Paging does not depend on the SIP server and can be configured independently. However, the network used for Multicast Paging configuration must support multicast transmission.

This feature is not supported in the IP Office environment in CCMS mode.