Be sure to account for the cost of maintenance and configuration changes such as adding new external trunks. And beware of long-term relationships and costly after-sales support. Technology is becoming more standards-based. If your requirements change, you will want some flexibility. If you find this to be a bit overwhelming and your budget permits, a consultant can save you time and money by keeping the resellers honest and helping to negotiate the best deal for you.
Interactive Buyer's Guide Charts on IP PBXs
Digital convergence white papers & research reports
Digital convergence books
IEEE802 Ethernet standards
The Society of Telecommunication Consultants
Telephony and the standards and protocols related to VoIP PBXs
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