This feature became available in Release 3.5 / D2 software
1369 Provide Calling Number Display for the 0 To provide
My Line when an incoming call is terminated to the Sub Line of Multiline Termi- 1 Not provided
nal
[8300R3.5]
It is on page 3-192 of the SV8300 Command Manual, issue 9.1
Below is from the 3.5 Release Notes document:
Enhanced Features
Caller ID Sub-Line
This enhancement provides caller ID on the LCD of DT300/700 display terminals on
ringing and call termination to a sub-line. The same sub-line can appear on hundreds of
phones and displays the CID Name and Number to all terminals at the same time.
Caller ID Display is automatically provided on ringing and call termination, no manual
operation is required.