In addition to above, I would look for the following in new system: Must: support the exact same extension ranges. Must: support quick modifications and the a

In addition to above, I would look for the following in new system: Must: support the exact same extension ranges. Must: support quick modifications and the addition of extensions as desired (ie. unlimited extensions). Must: support landline phones as well as cell phone forwarding. Must: support Canada & US numbers. Must: allow custom availability hours per forwarded number or extension. Should: allow for easy toggling of numbers/extensions on/off. Should: offer landline/VOIP service without needing to go to a traditional telecom. Must: allow porting of our existing toll-free number. Toll free minutes must either be flexible (per minute charge ok) or unlimited. Must: allow incoming and outgoing calls from the toll free number, via landline and mobile phones. Must: allow voicemail for any/all extensions, with notifications when a message is left. Must: allow single layer greeting message system. Multi-layer is a bonus. Must: allow for custom recorded greetings for all points of the message interface. Must: allow for important contacts or integrate with a given device’s contacts. Should: support something more robust than simple sequential forwarding. Someone having their phone on silent or “declining” a call shouldn’t interfere with the customer rules, and customers should never reach an employee’s personal voicemail rather than the system voicemail. Should: support detailed reporting for tracking usage. Should: allow recording of all calls. Should: allow international (EU & asia) calling at reasonable rates Hope: API to export metrics would be wonderful.