A business that currently has 3 physical locations is looking at moving from 3-5 external PSTN numbers and 3 separate phone systems to a single external PSTN number at the main office, and an integrated VOIP system connecting all three locations seamlessly. There are 8 phones at one location, 9 at another, and 4 at a third.
At a maximum, there would be 5-6 users of the external PSTN line at any one time.
One essential requirement is intercom over speakerphone between any two phones. From what I can tell, most of the common SIP phones do support this, so I don’t think that is a problem.
Some questions I have:
- Am I likely to have any stability issues deploying Asterisk in this way? Reliability is very important.
- Which version is most stable at the moment?
- Would it be more efficient to have one central * server at the main office, and connect to all the SIP phones over the WAN/LAN as needed, or have one * server at each location (total 3) with IAX over WAN between them and have each phone connected over SIP/LAN to the local * server?
- Whether using 1 or 3 servers, what specs would they need (roughly)?
- Would a 3.0 Mbps down / 1.0 Mbps up connection at each location suffice, if this was also handling email/web traffic?
- There are currently some feature-rich regular telephones at each desk in the main office that can do voicemail / intercom / etc. Is there any chance these existing phones could be used temporarily by connecting them via the existing internal phone lines to a * server, or would I be much better off replacing them all with SIP phones? (There’s no point keeping them if the intercom / speakerphone wouldn’t be supported). Unfortunately, I’ve forgotten what the make/model number is.
- Is it realistic for a person with no PBX or telephony experience, but who is very technically minded and very comfortable with Linux to set up and direct installation of such a system within a month?
Thanks for reading and answering any of these questions.