I quite new to the VOIP world and would like to advice regarding our setup.
At our head office we are running Avaya s8300 gateways with about 300 IP phones connected to 3750 switches.
We have about 20 remote offices, but these offices are only have about 10 members of staff in each. The phones are all on the PSTN. The have about 2mbps VPN connection to each site. I would like them to be able to use voip over the WAN instead of the PSTN.
What I would like to know is that are there in Cisco routers I can purchases with that will be able route VOIP traffic back to the head office with out me having to install Avaya Gateways at each site?