Pfft, to ensure your WAN has no issues with your IPSec mesh, make sure your ACLs are set, get OSPF or BPG working, and be sure to set your TCP MSS so that you don't get DF flags causing issues due to MTU. And to ensure your VoIP QoS setup the VLANs with appropriate CoS to ensure your RTP is smooth, and that your SIP ALGs are setup properly