Could you please elaborate?  How are you taking advantages of RingCentral at the moment?  Are you making phone calls or forwarding calls with it?

> So we don't have to manually add or remove numbers in the extensions.

I don't quite understand this action. More detail is appreciated.

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Thanks for your response Tyler. Our current setup has, Under a Department, Under an extension, we have 7-10 volunteers. The call will ring simultaneously for all the 7-10 volunteers and who ever picksup first will answer. Now, the availability of these volunteers varies from day to day and week to week. So we are looking to build an external application where the volunteers will update their availability and this application to be integrated to Ring Central. This means, their cell phone numbers are dynamically maintained through that application and RingCentral will add or remove their numbers depending on their availability feed. This whole effort is to automatize which volunteer numbers are picked to handle customer calls. My final question is, Can we develop an application like this and does RingCentral Developer API, SDK's support this ?

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I am pretty sure that RingCentral supports it. But I am not an expert. I will find an export and reply to your on Monday.

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 I believe this is what you are looking for: https://github.com/ringcentral/ringcentral-api-docs/blob/master/docs/call_queue.md 

I might be able to provide you with more information on Monday.

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