Sony SPP-A700 - Manual (Page 38)

Using "Caller ID with call waiting" service
This telephone is eompntihle with the "Caller ID with call waiting"
serv ice. Make sure that vonr telephone company otters this service.
Like the basic Caller ID service, vou need to subscribe to "Caller ID
with call waiting" in order to use this service.
Even though you may have already subscribed to "Caller ID" and
"call waiting" as two separate services, you need to request a
subscription to "Caller ID with call waiting" as a single service.
This is a new service that combines the two services.
Even though you now have a Caller ID with call waiting
compatible phone, unless you subscribe to the combined "Caller ID
with call waiting" service, you will not be able to see the name
and number of the second caller.
When a new call comes in while you are talking, the caller's name
and/or phone number of the new call appears on the display for about
20 seconds.
To switch to another caller
1
Ttr switch to the new caller,
press
(CALL WAltlNG/FLASlT).
To switch back to the first caller,
press
CCALL waiting / flas FQ
again.
38™ Caller ID Features