i'm from ISP and one my customer has 2 locations connected thru VPN-GRE tunnelling , and both of them connected to my PoPs in different areas via wirless P2P outdoor links each of them 2Mb national, on their border routers we configured QoS to classifying and marking traffic for Voice and Vedio traffic. note that; thier wireless links in both locations connection in my POPs to MLS 3750 as a L3 port we normal configuration
ip add 172.17.201.17 255.255.255.248
The problem is the customer complains about huge packet loss when they start the Vedio conferencing with the 2nd branch causes the link to be down.
So please what is your suggestions to solve this problem and is there any configuration must be added in my ISP-MLS switch?