Advanced Phone Features101answering the intercom call. If Warning Tone is disabled, the phone automaticallyanswers the intercom call without warning. Intercom Tone is enabled by default.Intercom BargeYou can enable or disable the phone to automatically answer an incoming intercom callwhile there is already an active call on the phone. If Intercom Barge is enabled, thephone automatically answers the intercom call and places the active call on hold. IfIntercom Barge is disabled, the phone handles an incoming intercom call like a waitingcall. Intercom Barge is disabled by default.You can use multicast paging to quickly and easily forward time sensitiveannouncements out to people within the multicast group. You can configure a multicastpaging key on the phone, which allows you to send a Real Time Transport Protocol (RTP)stream to the pre-configured multicast address(es) without involving SIP signaling. Youcan configure the phone to receive an RTP stream from pre-configured multicastlistening address(es) without involving SIP signaling. You can specify up to 10 multicastlistening addresses.To configure a multicast paging key via phone user interface:1. Press Menu->Features->DSS Keys.2. Select the desired DSS key.3. Press or , or the Switch soft key to select Key Event from the Type field.4. Press or , or the Switch soft key to select Multicast Paging from the KeyType field.5. (Optional.) Enter the string that will appear on the LCD screen in the Label field.6. Enter the multicast IP address and port number (e.g., 224.5.6.20:10008) in the Valuefield.The valid multicast IP addresses range from 224.0.0.0 to 239.255.255.255.7. Press the Save soft key to accept the change or the Back soft key to cancel.Multicast paging key is configurable via web user interface at the path DSSKey->LineKey.You can also configure the phone to use a default codec for sending multicast RTP