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If you are going to depend on your phone system, it is still better to run a traditional line into your business and then let your VoIP system take care of your internal call handling. VoIP over the internet still has issues.
This is probably the best solution I've found for any business that needs more than around four lines.Another vote for Asterisk with a T1 card here.
Cisco's VOIP products (Call Manager, Phone handsets, Unity (voicemail)) are widely used in large corporations.
And rightly expensive for that reason.
For most people who post here, Asterisk plus a T1/E1/FXO/FXS card/gateway would probably be the best option, considering price a majority of the equation.
Cisco CallManager Express is an option for smaller organizations, and is considerably less expensive than going with a full CallManager setup. There is also an Express version of Unity, and you can run both on the same router. These run on the ISR's starting at the 2801 model.
Cisco CallManager Express is an option for smaller organizations, and is considerably less expensive than going with a full CallManager setup. There is also an Express version of Unity, and you can run both on the same router. These run on the ISR's starting at the 2801 model.