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VoIP with NEC phone system

I have a NEC phone system. I am using a PIX515e firewall and have both hardware and software VPN's coming into it. I have attempted deploying IP phones on these VPN's. The quaility of the calls has been terrible. I configure LLQ and packet tagging with a policy map but neither has helped. My bottle neck of coarse is the Internet. I am using a 2621 router with 2 T1's configured in a multilink. QoS is new to me. Does anyone know if there is any additional compression I could do to the packets which might help. I am at the point were I am will to try anything.

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Re: VoIP with NEC phone system

If you are running PIX code 7.0 then I would suggest that you post your config (after altering it enough so that your actual public IP addreses are hidden of course) for the PIX and the router and let someone here (not me LOL) take a look at it and make suggestions.

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