Specifications

169
Talkback and End-to-End Loop Start Trunks
When the called pager answers by keying up, the caller will hear ringback cease and the
talkback pager operator speaking a greeting.
If the two parties talk to the time limit allowed for talkback calls on the channel, the caller
will hear “your time limit has expired” (if system voice prompts), followed by fast busy.
If the mobile fails to key up within the mobile activity timeout for the channel, the caller
will hear “your time limit has expired” (if system voice prompts), followed by fast busy.
Otherwise, the two parties will hang up when they are done talking.
If the called pager does not answer the caller will hear “the pager did not answer, please
try again later” (if system voice prompts), followed by fast busy.
Unless the subscriber is set up for “forward on no answer / system busy”, by having a
second mode programmed in their subscriber database record. Then the call will forward
to being handled as if it were for the second non-talkback mode.
The caller can hang up at any time in the preceding sequence of events. If there is no voice
message taken and the caller hangs up before the 0.3 second 1 kHz tone, then an alert only
page (or a display message if the paging format supports one) will be sent based on
whether “send empty message” is yes (send it) or no (do not send it). If there was a voice
message taken and the caller hangs up before the 0.3 second 1 kHz tone, then the voice
message will be delivered to the talkback pager, without any subsequent ringouts. If the
caller hangs up after the 1 kHz tone is played to them, the page will be sent to the talkback
pager and the ringback cut off at the point the caller hung up.
A breakthrough page can occur at any time during the call, unless the talkback page is a
breakthrough page. The caller is unaware if it happens before the 0.3 second 1 kHz tone. If
a breakthrough page occurs after the 1 kHz tone, even while the two parties are talking, the
caller will be requeued with ringback (2 seconds on, 4 seconds off), for later rebroadcast if
they stay offhook.
Talkback and End-to-End Loop Start Trunks
Talkback works best with a phone trunk interface other than end-to-end loop start. With an
end-to-end loop start interface the caller hanging up cannot be detected.
For non-talkback paging the end-to-end loop start trunk card can be programmed to
disconnect on several seconds of no voice being seen (VOX disconnect). This is not
compatible with talkback, since the caller may spend considerable periods listening, rather
than speaking.
For talkback, the end-to-end loop start trunk must have VOX disconnect disabled. Thus,
the talkback call will end due to the mobile activity timeout, since the caller’s hanging up
will never be seen. If the caller were to hang up during the period of time before they hear