[Asterisk-Users] Polycom 501 power over ethernet

[Kevin P. Fleming]

William M Conlon wrote:

>     switch :: Polycom injector cable :: RJ45 coupler :: patch cable :: 
> Polycom 501

You can do this, but it's not recommended. The power supply is 12V DC,
and the wires in a patch cable are usually stranded and very fine gauge.
This will cause voltage drop if you use a longer cable between the
injection point and the phone; this is one reason why PoE is 48V, so
that the voltage drop is not as large a percentage.

It may very well work for you, you can certainly try :-)