Panasonic KX-TD500 System Reference Manual page 593

3.04 Off-Hook Call Announcement
(OHCA)
Description
When the called PITS extension is busy talking
on a DN or CO button, and the OHCA button is
idle, OHCA allows the calling extension user to
inform the called party that another call is waiting,
through the built-in speaker of the called party's
PITS telephone.
OHCA works when the called PITS extension is
under the following conditions:
• The called extension's telephone is PITS
KX-T123230D, KX-T123235, KX-T7130 or
KX-T7235.
• The called extension's handset is off the
hook.
APITS and DPITS
• Basic shelf, expansion shelf 1, 2 have
fifteen OHCA path which are connected
each other.
APITS
• To activate this function by PLC or HLC
card, OHCA card (KX-T96136) is needed.
DPITS
• To activate this function, TSW Digital OHCA
card is needed.
DLC and DHLC card with DPITS
• A DLC card allows 8 DPITS telephones can
be called with the OHCA feature at the
same time.
DHLC card with APITS
• A DHLC card allows one APITS telephone
can be called with the OHCA feature at the
same time.
In the system programming, assign "System-
Class of Service (1/3)", BSS/OHCA to "Yes" at
calling extension, assign "Extension-Station
(1/3)", OHCA Circuit to "Yes" at the called
extension and assign "OHCA Button" at the
called extension.
Programming
System Programming
"System-Class of Service (1/3)",
BSS/OHCA
"Extension-Station (1/4)",
OHCA Circuit
"Extension-Station (2/4, 3/4)",
DN key Type
Conditions
OHCA does not work if the called PITS extension
is under one of the following conditions:
• The OHCA button is not idle
• Talking in the speaker phone mode
• Setting BSS/OHCA Deny
• Setting Do Not Disturb
• Using headset
Operation
Executing OHCA
1. Lift the handset.
• You hear dial tone 1, 3, or 4.
2. Dial the directory number of the
other extension.
• You hear busy tone.
3. Dial " 2 ".
• When the extension is off-
4. Talk to the other party.
5-A-13
Reference
VT Dumb
10-D-4.01 11-C-7.00
10-G-1.01 11-C-24.00
10-G-1.02 11-C-26.00
10-G-1.03
hook, you hear confirmation
tone 3.