I’ve been studying and reading a LOT on IP Phones, SIP providers and Asterisk. I need a simple setup for a small business office:
 1 Phone number for incoming calls (DID)
 4 IP Phones for 4 people
 Ability to have individual voicemails
 Ability to make multiple outbound calls, and receive multiple inbound calls at once on occasion.
If I understand everything correctly, I need to:
 Purchase a plan from a SIP Provider with multiple channels (to make multiple calls at once), from some place like axvoice.com?
 Purchase a computer and install Asterisk, and setup asterisk with the SIP provider details.
 Purchase IP Phones, and connect the phones to the Asterisk server. (Similar to as shown here (??): http://sysadminman.net/blog/2011/using-a-ciscolinksys-spa-504g-with-asterisk-and-freepbx-2714
 Setup extensions in Asterisk to handle the incoming calls.
Is this correct? I feel like I almost have it all figured out… I just have to actually get to doing it. But I’d hate to get everything purchased and setup… only to find that I missed one detail or something doesn’t work like I thought it did.
Thanks for any help!