SpeedFusion Hot Failover is a premium add-on that manages multiple redundant connections to keep VPNs and VoIP deployments up and running at all times. With other VPN technologies, WAN failover terminates existing site-to-site VPN connections, creating costly downtime.

Dec 05, 2009 IPsec VPN: EzVPN, GRE, DMVPN, VTI, GETVPN – CiscoZine Apr 26, 2011 Routing IP phones over wireless bridge with IPSEC tunnel Oct 27, 2010 QoS over a Site-to-site VPN - Cisco Meraki

Apr 26, 2011

From the diagram above we assume that we have already configured the IPSEC VPN and is working properly (i.e both subnets 192.168.1.0/24 and 192.168.2.0/24 can communicate via the tunnel). The example configuration below is for the ASA-1 firewall and should be applied accordingly to ASA-2 for better QoS performance. Adtran NetVanta 3430 Router with IPSec VPN - VoIP Supply The NetVanta 3430 with VPN and VQM offers enhanced performance IPSec VPN throughput capabilities to allow for fast network convergence of voice and data traffic through an encrypted network. By supporting IPSec, the NetVanta 3430 is fully compatible with other IPSec VPN …

QoS over a Site-to-site VPN - Cisco Meraki

I recently had an issue just like this with a cisco voip installation where we had 1 way audio over a VPN. It turned out that there where access-lists that were blocking the audio traffic in one direction. Once we found the offending ACL and added permissions for the traffic, it was cleared up instantly.