There are additional modifiers for the Local channel as well. They include:
- 'n' - Adding "/n" at the end of the string will make the Local channel not
do a native transfer (the "n" stands for "n"o release) upon the remote
end answering the line. This is an esoteric, but important feature if
you expect the Local channel to handle calls exactly like a normal
channel. If you do not have the "no release" feature set, then as soon
as the destination (inside of the Local channel) answers the line and
one audio frame passes, the variables and dial plan will revert back
to that of the original call, and the Local channel will become a
zombie and be removed from the active channels list. This is desirable
in some circumstances, but can result in unexpected dialplan behavior
if you are doing fancy things with variables in your call handling.
- 'j' - Adding "/j" at the end of the string allows you to use the generic
jitterbuffer on incoming calls going to Asterisk applications. For
example, this would allow you to use a jitterbuffer for an incoming
SIP call to Voicemail by putting a Local channel in the middle. The
'j' option must be used in conjunction with the 'n' option to make
sure that the Local channel does not get optimized out of the call.
This option is available starting in the Asterisk 1.6.0 branch.
- 'm' - Using the "/m" option will cause the Local channel to forward music on
hold (MoH) start and stop requests. Normally the Local channel acts on
them and it is started or stopped on the Local channel itself. This
options allows those requests to be forwarded through the Local
channel.
This option is available starting in the Asterisk 1.4 branch.
- 'b' - The "/b" option causes the Local channel to return the actual channel
that is behind it when queried. This is useful for transfer scenarios
as the actual channel will be transferred, not the Local channel.
This option is available starting in the Asterisk 1.6.0 branch.
lmadsen
2010-10-21