Panasonic KX-tg2740s Operating Instructions Manual page 67

to transfer
0-8=Ext.ens ion
9=Mailbox
-.-1
Ex. Calling Base
r- -- -.--..----.---..'-"--.'-".'../
+
_-
Ex. lntcrcom with Base
Ex. Nmdsel 1 calling
111
.esr; the relevant line buttorn,