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AVAYA
not sure here what you are asking for is VOIP service vender or VOIP hardware vendor
FOR the hardware phones are from cisco high quality fammous and good looking and can interoperate with sip
POE CISCO always with voice QOS vlan
and for IPPBX use Astrix free highly flexable expandable and unlimited third part modules vpn and so much more i just cant stop loving iit
On a personal basis, Vonage is definitely worth the money.
