Page 541 - Asterisk™: The Future of Telephony

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digit
The maximum amount of time permitted between digits when the user is typing
in an extension. When this timeout expires, after the user has started to type in an
extension, the extension will be considered complete, and will be interpreted. Note
that if an extension typed in is valid, it will not have to timeout to be tested, so
typically at the expiry of this timeout, the extension will be considered invalid (and
thus control will be passed to the i extension, or if it doesn’t exist the call will be
terminated). The default timeout is five seconds.
response
The maximum amount of time permitted after falling through a series of priorities
for a channel in which the user may begin typing an extension. If the user does not
type an extension in this amount of time, control will pass to the t extension if it
exists, and if not the call will be terminated. The default timeout is 10 seconds.

TXTCIDNAME DNS lookup
TXTCIDNAME(number)

Looks up a caller name via DNS.

URIDECODE Decodes a URI
URIDECODE(data)

Decodes a URI-encoded string according to RFC 2396.