Page 414 - Asterisk™: The Future of Telephony

N
This option is a modifier for the screen/privacy mode. It tells Asterisk not to screen
the call if Caller ID is present.
o
Uses the Caller ID received on the inbound leg of the call for the Caller ID on the
outbound leg of the call. This is useful if you are accepting a call and then
forwarding it to another destination, but you wish to pass the Caller ID from the
inbound leg of the call instead of overwriting it with the local Caller ID settings.
This was the default behavior on Asterisk versions prior to 1.0.
O[x]
This option turns on Operator Services mode on a Zaptel channel. If this option is
used on a non-Zaptel interface, it will be ignored. When the destination answers
(presumably an operator services station), the originator no longer has control of
her line. She may hang up, but the switch will not release her line until the desti-
nation party (the operator) hangs up. Specified without an arg, or with 1 as an arg,
the originator hanging up will cause the phone to ring back immediately. With a
2 specified as the argument, when the “operator” flashes the trunk, it will ring the
caller’s phone.
p
This option enables screening mode. This is basically Privacy mode without
memory.
P[(x)]
Sets the privacy mode, optionally specifying x as the family/key value in the local
AstDB database. This option is useful for accepting calls based on a blacklist (ex-
plicitly denying calls from listed numbers) or whitelist (explicitly accepting calls
from listed numbers). See also LookupBlacklist().

r
Indicates ringing to the calling party, without passing any audio until the call is
answered. This flag is not normally required to indicate ringing, as Asterisk will
signal ringing if a channel is actually being called.
S(x)
Hangs up the call x seconds after the called party has answered the call.
t
Permits the called party to transfer a call by pressing the # key. Please note that if
this option is used, reinvites are disabled, as Asterisk needs to monitor the call to
detect when the called party presses the # key.
T
Permits the caller to transfer a connected call by pressing the # key. Again, note
that if this option is used, reinvites are disabled, as Asterisk needs to monitor the
call to detect when the caller presses the # key.

386 | Appendix B: Application Reference