Avaya 9621G - Answering a call on a bridged line; Picking up a call to another extension

If you are using the SPEAKER, the HEADSET, or the call appearance line, the
phone displays the plus (+) softkey on the screen.
2. Dial the number that you want to call.
Dialing an E.164 number
Using Avaya 9621G/9641G IP Deskphones SIP November 2013 49