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VPN and Remote VoIP dropping

I have a remote user who currently has a Cisco VoIP phone that  connects into our network via TFTP. He informs me that the phone drops  several times throughout the day, with an occasional drop in VPN from  time to time. His router has the most current firmware, set QoS rules  priortizing the phone and VPN, and decreased the MTU rate, yet he still  experiences these drops. He used a VoIP phone from his last job, and  never experienced a drop. 

I'm not exactly sure how else to go about troubleshooting this. Anyone care to throw me some ideas?

A little info of our current setup:

Cisco 2821 Intergrated Services Router, with CUCM version

Cisco ASA 5510 software version 8.2(4)


VPN and Remote VoIP dropping

What type of vpn is configured ? Did you look at logs its just VPN is getting dropped or the voip call ?

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