Comdial 8312S System Reference Manual page 50

Transferring Calls
If the intercom party is busy, take one of the following steps (if
made available at your telephone by installer programming):
1. Press RECON to reconnect the call to your station.
2. Press SOHVA to interrupt the call and tell the intercom party that a
call awaits.
3. Press MSG to leave a message-waiting indication at the called
station.
If the intercom party does not answer their telephone when
ringing, take one of the following steps:
1. Press RECON to reconnect the call to your station.
2. Press MSG to leave a message-waiting indication at the station.
5 – 2 LCD Speakerphone Reference Manual
GCA70–250