Configuring Softkeys41-001524-00 REV01 – 07.2014 101Paging KeyYou can configure a Paging key on the phone that allows you to send a Real Time Transport Protocol (RTP) stream to pre-configured multicast address(es) without involving SIP signalling. You enter a multicast IP address(es) and a port numberfor the Paging key, that when pressed, initiates an outgoing multicast RTP session. This is called Group Paging on the IPphones.You can also specify group paging RTP addresses that the phone listens for when receiving RTP streams. You can specifyup to 5 listening multicast addresses at the path, Basic Settings > Preferences > Group Paging RTP Settings.For more information about Group Paging and how it works, and to specify multicast addresses, see “Group RTP Paging”on page 165.Configuring a Paging Key Using the Aastra Web UIAastra Web UI1. Click on Operation > Softkeys and XML.orClick on Operation > Expansion Module .Softkeys2. Select from Key 1 through Key 20 on the Top keys.orSelect from Key 1 through Key 18 on the Bottom keys.3. In the Type field, select Paging.4. In the Label field, enter a label to apply to this key.5. In the Value field, enter a multicast IP address and a port number for the Paging key. When you press this key, thephone initiates an outgoing multicast RTP session to the specified address using the specified port (e.g.239.0.1.15:10000).Notes:1. When you select Paging for the Type field, the Line field is disabled.2. The Value field allows for one multicast address entry only.6. To receive RTP steams for group paging, you must also configure the Paging Listen Addresses parameter at thepath, Basic Settings > Preferences > Group Paging RTP Settings. For more information about setting this parameter,see “Group RTP Paging” on page 165.Expansion Module Keys7. Select from Key 1 through Key 16.8. In the Type field, select Paging.