How can I get incoming call notification to a specific extension from a specific work station?

I am working on a project like customer service which more than six users respond to callers on their own stations. I want to know how can I get a notification for incoming call on a work station by web app developed on PHP?
ahmadfahimfaiezAsked:
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Ray PaseurCommented:
The industry standard for this is Twilio.  There may be other competing services, but in my experience, Twilio is fast, accurate, well-documented, has a large user base, has excellent technical support, and is the only really good choice.  Best of luck with your project, ~Ray

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