VoIP / IP Telephony / Digital
got a question here, hoping someone here can give me advice.
Essentially, the college currently has an ISDN30 digital phone line coming into the school. We have used it up to now, but have reached maximum capacity on number of handsets available (i.e. number of extensions).
This wouldn't be so much of an issue, but we are building a new block, and will require an additional 40-50 handsets, which our current system can not handle.
We have three options, and am looking for advice on what to do.
1: Stay with current supplier, and have a VoIP system ONLY in the new block, therefor have a mixed system.
2: Move to a new supplier, and revamp the whole system. That is, VoIP in the new block and the new block, but a digital line to the outside world.
3: As option 2, but have IP telephony to the outside world, running on a dedicated adsl line.
Financially, 1) is cheapest, however, cost difference is not big enough to be a major factor in decision.
If anyone out there could help me with some advice, pros and cons of all three systems, or helpful words... please give :) All help received gratefully :)