[asterisk-users] Need help on how to programmatically call an extension & test call state

[eric weaver]

I would be grateful if someone could tell me where to find the docs to get
started on the following problem:

A program needs to be written to place a SIP call to a certain extension on
another Asterisk system, and see whether the call state ratchets up to
"ringing", then drop, and take action on the results.

Can anyone refer me to the appropriate starting point to read up on this?
Thanks.
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