I am working on a school project and have no experience with VoIP. I have a central office and 4 remote local sites for a newly partnered healthcare firm. The remote sites will connect to the main office via VPN tunnels through Cisco ISR routers. For the VoIP, Answering service, beeping service, and extension service I assume a PBX will be in order at the main site, but can the PBX distribute calls to all sites using the VPN tunnels or would ISDN lines be needed?
then my idea is valid. i guess I am asking what kind of equipment would I need on the remote end site? Would the new Cisco ISR's work or some smaller PBX type device?
2 comments… read them below or add one
You can have a centralized PBX at the main office and use VOIP to connect to it from the remote offices over VPN. You've got the right idea.
You will, however, need to make sure you have ample bandwidth for all of the locations.
RESPONSE TO ADDTIONAL INFO:
You don't really need any equipment other than IP phones and a VPN router in most scenarios.
This has caused many folk to ask the question, does this mean a few individuals will be ready to use their WiFi telephone in-flight free, while others will be made to use their mastercards in the in-flight telephone system, which is really expensive? So this begs another query : Is it fair for some passengers the grab all the bandwidth? Should they not pay more if they do? And will they permit people to download complete films too? Where does it stop? Are all airliners going have the equivalent of T1 lines through satellite in each aircraft? How else are they able to guarantee quality Internet speeds? Maybe , you can see why this whole WiFi idea could need to come with extra rules, and why it could need to be re-thought. You see, if everybody misuses the system, it is going to be of insignificant value to anybody.