You should be able to initiate a meet me conference to the Live Record extension using a FAC from an analog phone. You can change the FAC (and use a start code, for example) using this command:
UC500(config)#stcapp feature access-code
UC500(config-stcapp-fac)#?
STCAPP feature access-code configuration commands:
call Select call forward all feature
default Set a command to its defaults
meetme-conference Select meetme conference feature code
no Negate a command or set its defaults
pickup Select pickup local group feature
prefix Select feature access code prefix
Remember that the FXS ports need to be in SCCP mode.
Thanks,
Marcos