Configuring Advanced Features3175. Enter the desired voice number in the Voice Mail field.6. Click Confirm to accept the change.Multicast PagingMulticast paging allows DECT IP phones to send/receive Real-time Transport Protocol (RTP)streams to/from the pre-configured multicast address(es) on the desired channel withoutinvolving SIP signaling. Up to 31 listening multicast addresses can be specified on the DECT IPphone.The following describes 31 paging channels: 0: You can broadcast audio to channel 0. Note that the Yealink IP phones running oldfirmware version (old paging mechanism) can be regarded as listening to channel 0. It isthe default channel. 1 to 25: You can broadcast audio to a specific channel. We recommend that you specifythese channels when broadcasting with polycom IP phones which have 25 channels youcan listening to. 26 to 30: You can broadcast audio to a specific channel. We recommend that you specifythese channels when broadcasting with Yealink IP phones running new firmware version(new paging mechanism).The DECT IP phones will automatically ignore all incoming multicast paging calls on thedifferent channel.Sending RTP StreamUsers can send an RTP stream without involving SIP signaling by pressing a configuredmulticast paging key or a paging list key. A multicast address (IP: Port) and a channel (0 to 30)