What is the minimum/cheapest way to set up VoIP with Cisco equipment? I have an IP phone and several 2500 series routers, will that work? Do I need CallManager? Any help is appreciated.
You'll need some kind of VoIP Gateway.. You don't really need a Callmanager, you can get a 2600 series router, put some FXO cards in there, and run IP Keyswitch IOS on it.. That'll get you a basic setup. You'll need an external powersupply for the phone though.
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