Page 452 - Asterisk™: The Future of Telephony

user to press the # key). Defaults to 0 (no limit, wait for the user to press the # key).
Any value below 0 means the same. The maximum accepted value is 255.
option
Zero or more of the following options:
s
Return immediately if the line is not answered.
i
Interpret the filename as an indication tone setting from indications.conf.
n
Read digits even if the line has not been answered.
attempts
If greater than 1, that many attempts will be made in the event that no data is
entered.
timeout
If greater than 0, that value will override the default timeout.

; read a two-digit number and repeat it back to the caller
exten => 123,1,Read(NUMBER,,2)
exten => 123,2,SayNumber(${NUMBER})
exten => 123,3,Goto(1)

See Also
SendDTMF()

ReadFile() Reads the contents of a file in to a variable
ReadFile(variable=filename,length)

ReadFile captures the contents of filename, with a maximum size of length.
; read the first 80 characters of a file in to a variable
exten => 123,1,Answer()
exten => 123,n,ReadFile(TEST=/tmp/test.txt,80)
exten => 123,n,SayAlpha(${TEST})
See Also
System(), Read()

RealTime Looks up information from the RealTime configuration handler

RealTime(family,colmatch,value[,prefix])

Uses the RealTime configuration handler system to read data in to channel variables.
All unique column names (from the specified family) will be set as channel variables,

424 | Appendix B: Application Reference