Aastra 6753i User Manual page 58

Key Function
Phone Lock
Paging
Programmable keys can also be set up to quickly to access features such as Call Return (*69) or
Voicemail.
The following paragraphs describe how to configure each function listed in the previous table.
52
Description
Indicates the key is configured as a phone lock key, allowing you to press this
key to lock/unlock the phone.
Indicates the key is configured as a Paging key. When pressed, the phone can
send Real Time Transport Protocol (RTP) streams from a pre-configured
multicast address without involving SIP signaling. You can also receive RTP
streams from pre-configured multicast addresses (can specify up to 5
addresses) using the "Paging Listen Addresses" at the path,
Basic Settings->Preferences->Group Paging RTP Settings in the Aastra Web
UI. For more information about setting this parameter, see
(receives RTP streams)"
Note:
Quick access features like Call Return and Voicemail must first be configured
on your PBX in order to work on your phone. See your System Administrator for
more information.
on page 188.
Model 6753i IP Phone User Guide
"Group RTP Paging