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VoIP - PoE Switches vs. phone adapters

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Last Modified: 2015-10-09
We're in the early stage of looking to replace our aging phone system with VoIP.

Our 5 switches are Cisco 2960G ... Not PoE.

Aside from no 9-1-1 in a power failure, is there any disadvantage to using power adapters on each VoIP desk phone vs. replacing two or more of our switches with expensive new ones ?  We have maybe 75 phones.  I also read that a Cisco PoE switch may have 48 ports, but only 24 of them can provide PoE power. Is this generally true or just for certain switches ?

Thanks.
Stephen
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