Yealink SIP-T54S Administrator's Manual page 701

Procedure
Configuration changes can be performed using the following methods.
Central
Provisioning
(Configuration
File)
Specify a multicast codec for the IP phone to
send the RTP stream.
Parameter:
multicast.codec
Configure the multicast IP address and port
number for a paging list key.
Parameter:
multicast.paging_address.X.ip_address
Configure the multicast paging group name
for a paging list key.
Parameter:
multicast.paging_address.X.label
Configure the channel of the multicast
paging group for a paging list key.
Parameter:
multicast.paging_address.X.channel
Assign a multicast paging key.
<y0000000000xx>.cf
g
Parameters:
linekey.X.type/ programablekey.X.type/
expansion_module.X.key.Y.type
linekey.X.value/ programablekey.X.value/
expansion_module.X.key.Y.value
linekey.X.label/ programablekey.X.label/
expansion_module.X.key.Y.label
linekey.X.shortlabel
linekey.X.extension/
programablekey.X.extension/
expansion_module.X.key.Y.extension
Assign a paging list key.
Parameter:
linekey.X.type/ programmable.X.type/
expansion_module.X.key.Y.type
linekey.X.label/ programmable.X.label/
expansion_module.X.key.Y.label
linekey.X.shortlabel
Configuring Advanced Features
675