AT&T SYSTEM 25 Manual page 134

Extending Calls (Announced)
Extending a call consists of placing an active call on temporary hold (splitting), placing
another call to an inside party or an outside number, and then connecting the two calls
together. The attendant can contact the called party to see if the call will be taken. For
information on extending calls without announcing the call, see the entry, "Extending
Calls (Unannounced), " on page 3-21.
The attendant extends calls for the following reasons:
A party on a trunk call wants to be connected to a station inside the system.
A party inside the system wants to be connected to an outside number via a
trunk.
A party inside the system wants to be connected to another inside station (an
unusual procedure because inside users can easily call each other directly).
A SLAC attendant can release from the calls or remain connected. SLAC consoles are
administered to have either Automatic Release or Automatic Hold. If the system is set up
for Automatic Release, the SLAC attendant can drop out of a call simply by pressing
another LOOP button. See the entry for "Automatic Release and Automatic Hold" on
page 3-5 for more information about these features.
A DTAC attendant does not have the option of remaining connected to an extended call.
If the attendant extends a call from outside System 25 to a busy voice terminal, the caller will
be placed on hold and the called party will hear a tone that indicates they have a waiting
(camped-on) call. If the person chooses not to take the call, it will return to the attendant
after a preset interval.
In general, the attendant should not use TRANSFER to extend calls; if TRANSFER is used,
busy or unanswered calls will not return to the attendant console for further handling. The
exception is when the attendant wants to extend an incoming trunk call to another trunk.
For more information about trunk-to-trunk transfers, see the "Transfer" entry in Section 2,
"Voice Terminal Features."
Before extending a call, the attendant checks with the called party to see if the call will be
taken. While the attendant is talking with the called party, the caller is on hold and cannot
hear the other parties.
Extending Calls (Announced) 3-17