[c-nsp] Recommended hardware for Voice VLANs over multiple sites

[Ben Hooper]

All,

Can anyone recommend what hardware/IOS would be required to support the
following network topology? (Assume /24 subnets)

                            4Mbps  --------
                           --------|Site 2|
             Data VLAN 1 /         --------
              10.10.10.1/            10.10.10.2 - Data VLAN 1
                --------             10.10.30.2 - Voice VLAN
   -------------|Site 1|                          Backup VoIP Server
      |         --------                          
      |      Data VLAN 2\
      |       10.10.20.1 \         --------
      |                   ---------|Site 3|
  10.10.3.1                 4Mbps  --------
  Voice VLAN                         10.10.20.2 - Data VLAN 2
  VoIP Server                        10.10.30.3 - Voice VLAN
                                                  IP Phone

We are looking at implementing VoIP over three sites connected by Metro
Ethernet. The VoIP vendor (not Cisco) supports redundancy, but requires the
two VoIP servers to be within the same L2 broadcast domain. Can something
like 2811's (with IP-Base) at each site with QoS to provision 1 Mbps on each
WAN link for the Voice VLAN over the top of the existing data network?

Cheers,

Ben.