The Telecom Reseller wrote about how both Avaya and Cisco have attacked the SMB PBX market in very different ways.
"Don’t assume that Avaya and Cisco are always selling to similar SMB customers. New research from The Eastern Management Group finds they are not. Avaya sales to first-time buyers are unimaginably strong. Cisco is the go-to company for features that improve employee productivity."
There are others in the SMB PBX space - ShoreTel, Samsung, Asterisk, Fonality, Panasonic and many others. The leaders get business two different ways. Avaya likely because of the brand name in PBX. Cisco always sells on features.
Which are you using? Your Brand? Low cost? Productivity? Or not sure?