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Voice & Video over MPLS

I would like to have some opinions about the following problem. I have attached a photo which describes the network.

1. You are the CSE and you are meeting with a customer that has a technical problem. Your customer has a central site with Call-manager, IP phones and 4 remote sites.

2. Each site connects to an MPLS/VPN via frame-relay between PE and CE. At the remote sites there are also IP phones. Each site has a 2M pipe towards the MPLS/VPN cloud. Every site (CE) has QOS configured.

3.The customer wants to add video conferencing.

Problem:

? The customer complains about intermittent bad voice quality

? Help solve the customer?s problem.

? Is is better to have over ATM or over Frame Relay video conference?

Thank you in advance.

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