Aastra Telecom RN-001029-00, REV 06 manual Multicast Group Paging, How it works

IP Phone Release Notes 2.2

Features in Release 2.2

Multicast Group Paging

An Administrator or User can configure a specific softkey on the phone that allows you to send/receive a Real Time Transport Protocol (RTP) stream to/from pre-configured multicast address(es) without involving SIP signaling. This is called Group Paging on the IP phones. You can specify up to 5 listening multicast addresses.

An Administrator can use the following parameters in the configuration files to set Group Paging RTP Settings:

•paging group listening

•softkeyN type, topsoftkeyN type, prgkeyN type, or expmodX keyN type

•sofkeyN label, topsoftkeyN label, or expmodX keyN label

•softkeyN value, topsoftkeyN value, prgkeyN value, or expmodX keyN value

An Administrator or User can use the following parameters in the Aastra Web UI to set Group Paging RTP Settings:

•Paging Listen Addresses (Basic Settings->Preferences->Group Paging RTP Settings)

•<Paging> Softkey (Operation->Softkeys and XML, Operation->Programmable Keys, Operation->Expansion Keys)

How it works

After pressing a configured “Paging” softkey on the phone, the Phone sends RTP to a preconfigured multicast address. Any phone in the local network then listens for RTP on the preconfigured multicast address. For both sending and receiving of the multicast RTP there is no sip signaling involved. The Phone displays the “Paging” message to the phone’s LCD.

Note: Multicast RTP is one way only - from sender to the receiver (i.e. from sender to the multicast address (receiver)).

The phone uses the G711 uLaw CODEC for multicast RTP.

60 RN-001029-00, Rev 06, Release 2.2