Sony PCS-TL50 Operating Instructions Manual page 256

Message
Use of the Private Phone Book is
not available.
The system is connecting to a
LAN via PPPoE.
Current call has been transferred.
Call will be transferred upon
disconnection.
Remote party of the transfer
destination disconnected.
Remote party of the current call to
be transferred disconnected.
The held call has been resumed.
Starts a conference. (The
encryption feature is enabled.)
Starts a conference. (The
encryption feature is disabled.)
256
On Screen Messages
Meaning
The "Memory Stick" in which the Private Phone Book is
registered has been removed from the Video Communication
System. You cannot use the Private Phone Book.
The Video Communication System is connecting to a LAN
using PPPoE.
The current call has been transferred to the other party via
SIP connection.
When you disconnect the line, the call will transferred to the
other remote party via SIP connection.
The line has been disconnected by the remote party to whom
you transferred the call via SIP connection.
The line has been disconnected by the remote party whose
call you are transferring to the other remote party via SIP
connection.
The held call has been resumed during a conference using
SIP.
The conference starts with the encryption feature enabled.
The conference starts with the encryption feature disabled.