We have four different sites connected over public network; Therefore, we are running site-to-site VPN tunnel to encrypt the data. Now we are ready to deploy Voice over VPN between four sites (CM Clusters are already deployed in all the locations).
I know the follwoing:
Standard IPSec copies the Type of Service (ToS) byte from the original IP
header of the Voice-over-IP packet to the new IP header added by IPSec. So
the original packet priority is preserved even after encryption.
It should work with the PIX and multiservice VPN enabled routers that you have deployed. Do you have the VPN established over the same backbone for instance are the edge internet circuits from the same ISP? LLQ is pretty important and the packet has to be recognized as a high priority packet through out the path so the ISP has to be Cisco certified for instance sprint was one of the first one to acknowledge the qos parameters on their equipment. It should work with DES or 3DES, but consider DES if there are latency issues already.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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