Warm Transferring; Call Forwarding - Cisco SPA504G Setup & User Manual

Then simply Dial the VoIP extension you require if transferring to someone
in the office or enter the mobile or landline number to which you want to
transfer the call.
Press the ―dial‖ soft key to transfer the call.

Warm Transferring

This allows you to speak to the person you are transferring to prior to transferring
the call.
While on the call, press the ―xfer key (This will place the caller on hold).
Then simply Dial the VoIP extension you require if transferring to someone
in the office or enter the mobile or landline number to which you want to
transfer the call.
When the second line rings, wait for the party to answer the call,
announce the caller press ―xfer again to connect the two parties.
Hang up or end the call.

Call Forwarding

Press the ―cfwd soft key
Enter the number you would like to forward to and then hit the dial button
to confirm. If successful will display as Calls Forwarded on your screen.
To stop forwarding Press the -cfwd soft key.
Or
Simply call *72