With lower call rate, less maintenance cost and consume minimum power, IP phone system have better return on investment than any other phone system. Besides, IP Phone system are more flexible, adding/dropping users is quick; There will be no downtime, even if internet is down, your call will be forward.
The best part of VoIP phone system is management, you can manage your system anywhere, just make a phone call. no matter where the phone is, great for you if you have offices in different locations.
IP phones are more portable compared to traditional phones. free the phone from power limit. Also IP phones have greater cord range, it goes up to 100m length. having a huge office or warehouse is no longer a problem.