Multiple extensions on phone and call routing questions

I apologize for frustrating you. Certainly not my intention as I need all the help I can get. I started this post with an apology if my terminology was wrong or ambiguous I think part of the problem with my terminology is that I am using Polycom IP 550 phones. These phones are described as multi-line phones. From my reading of the Polycom setup documentation each SIP registration on the phone is referred to by Polycom as a “line” and there can be up to 4 lines configured. Based on my understanding, with these phones you register a “line” with an extension on the SIP server.

  1. 4 DID numbers

  2. 4 companies

  3. 4 phones

  4. In my home office I have 2 main office locations with one business phone in each location. I also have 2 other locations where I have phones that I want to be able to receive incoming calls from the businesses. In each location where there is a phone I want the phone to ring and be able to receive a call from any of the businesses.

  5. There are 2 people full-time and 1 person part-time supporting the businesses.

  6. 4 voicemail boxes – One for each business.

  7. Yes. Each business only has one extension

  8. Correct. I agree that a ring group with one extension doesn’t make sense. This was more or less an experiment to see if I could get all of the phones with the same extension to ring. I have tried this and I have tried using an incoming route that had a destination of an extension. But as I said before only one of the 4 phones that had that extension would ring.

  9. Don’t know if the registration order makes any difference. Pure speculation on my part in trying to explain why all the phone don’t ring. Only one. Trying to figure out what was different about that phone if they are all configured the same caused it to ring and not the others.Don’t know if the registration order makes any difference. Pure speculation on my part in trying to explain why all the phone don’t ring. Only one. Trying to figure out what was different about that phone if they are all configured the same caused it to ring and not the others.

  10. Agree Ring group is not necessary in this case. Can accomplish this by just pointing an inbound route to the extension.

I really hope I have better explained what I’m trying to do and why. I just need to know is it possible to have a phone that is configured to have connections to multiple extensions defined using FreePBX to receive incoming calls on each extension and have the phone ring on each phone where that extension is authorized? And, if so How?

Thank you for your patience and willingness to help. If I could ask the questions better I would. And in the future I’ll be careful to answer all questions I’m asked.