Cisco ASA5505-SEC-BUN-K9 Security Plus Bundle - VoIP Supply
Oct 24, 2012 VoIP (SIP) over Mobile VPN (IPsec) on Nokia N85 Aug 06, 2010 WAN using IP VPN over Internet vs MPLS - Pros and Cons Jun 01, 2015 FortiGate 60D Site-to-Site VPN loses VoIP packets Nov 14, 2016
I've done VoIP over Internet VPN and in every situation, all QoS marking were lost once it hit the ISP. I still did the QoS out to the edge of course (on both sides of the VPN). Call quality varied location by location. Sometimes there was never an issue, and sometimes there was a lot of random jitter and audio dropout.
VOIP thru IpSec VPN problems | Netgate Forum Sep 22, 2017
PepVPN - Peplink
Cisco ASA QoS for VoIP Traffic - Networks Training 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.