[Asterisk-Users] Hardware for 20 extensions (voip vs analog)?

[Felix Pizarro]

Hi. I am evaluating the installation of ~ 20 extensions and 4 telco lines.  The customer asked me to compare costs and features of doing it all with voip phones or using analog phones.
 
I think that the analog route would involve a T1 card, a channelbank (probably adit 600) and 20 new phones (probably aastra 9116).
 
On the voip route, do I need something else in the asterisk box other than the ethernet card (and the 20 phones, probably cisco)? Of course I know I will need the TDM400 for the telco lines in both options.
 
Is there anything I'm missing? This will be my first installation so any help would be appreciated. Thanks.
 
What advantages do the voip route has, if any for this installation?

		
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