1 central location + 60-70 remote locations… all remote locations will have 2 PPTP tunnels to the central MKT (arround 120-140 PPTP tunnels on central MKT), half of that tunnels are for voip and there will be pratical not in used… on remote locations will be 1-2 phones.. other half of the tunnels will be used for data traffic. Central side will have 3 internet links (two for VPNs, one for data and the secondone for voice) + third for Internet for local users (two or three subnets, around 100 users). Basic firewall and some marking will also be on central MKT.
yes, there will be little traffic… al will go without prioritization, each remote location has dedicated wan link just for voice which will be connected to central site (also dedicated link just for voice PPTP)