I made a script earlier this year which telnet into a Voice Gateway, send command "show voice call summary" and retrieve and parse the response. This script is used to determine if one or more FXO ports are busy or not.
In order to do that, I built a custom Java class. Within this class I used the Apache Commons Net library.
I did this project to solve a problem with a Valcom paging system. This paging system is use with an IPCelerate server in order to provide paging for more than one port (zone) at a time. The problem was that when a user dials a multi-zone extension number, he doesn't know if one of the port associate with the multi-zone is busy or not. So, his call goes through but the page is then heard only in the zone where the ports are idle.
So, I made this script in order to verify the ports state prior to forward the call to the IPCelerate server. If one or more ports within the multi-zone is busy then a busy signal is played.
I attached the custom Java class and a jpg of the script.
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