Execute dialplan context from command line

I'm trying to execute an extension from the command line (via asterisk -rx "command") on a context that makes a AGI based query to determine which extension needs to be dialed (these extensions are updated on the DB).

It's something like this:

[autodialer]
exten => 2,1,Answer()
exten => 2,n,AGI(database_query.php); Makes a database query and generates vars
exten => 2,n,Set(CALLERID(name)=${db_customer_name}); Sets callerid from DB data
exten => 2,n,Dial(SIP/${db_customer_extension}); Also, extensions are stored on DB
exten => 2,n,Playback(custom/important_message)
exten => 2,n,SayDigits(${important_numbers}); The message, stored on DB too.
exten => h,1,Hangup()

Here, I need that context executed from command line, without having to dial it from any extension (it is supposed to be executed with a crontab every X time).

I tried with originate command, but I think I misunderstood the command syntax and didn't work.

I think that it should be something like: asterisk -rx "channel originate 2@autodialer" and then Asterisk executes that context and we're all happy with our important numbers.

I know that's not the right syntax, just trying to explain how I imagine it could work.

Thanks for your help.

There are no way do originate only one leg. You have supply second argument(other channel dest)

if you not need other channel, create context like this

[wait]

exten =>s,1,Wait(10000)

and use

asterisk -rx "channel originate 2@autodialer s@wait"

Read this article:

http://www.voip-info.org/wiki/view/Asterisk+auto-dial+out

NOTE: it is not recommended do diallout apps for people with less then 5 years dedicated asterisk experience. If you want one, use vicidial.org or other dialler.