I have an Avaya IP Office Solution at the main office. The ISP & SIP Provider are providing a dual handoff to our network with 0/0 going to the data network and 0/1 going to the WAN of the Avaya IP Office. The remote handsets connect to the IP office through VPN which is terminating through the ISP's router 0/0 and finally at a Cisco ASA.
Our network is unique as we also have a Watchguard Firebox running side by side with the Cisco ASA. Normal data traffic is routing through the Watchguard. Currently the only thing that the ASA is doing is performing VPN termination and once the VPN's are termianted forwarding the traffic to the phone server. Obviously remote handset to remote handset RTP traffic is being routed through the ASA, and signaling forwards to the phone server.
1.) Our remote handsets are experiencing QoS issues (low audio, choppy calls, disconnected calls).
2.) Our local handsets are not have any problems whatsover (as the QoS is being performed by the ISP's router)
3.) Remote sites have 20Mbit connections to the internet, and the main site has a T1x3 connections.
Theory: I believe that the Voice packets encapsulated in the IPSec VPN are being treated as raw data and not prioritized as being Voice traffic.
Also because we are not using one firewall to manage the LAN QoS this could actually be causing more problems as their is no prioritization of the VPN traffic over standard data.
The question is: Is this what is actually happening and if so what are the recommended solutions for this repair.