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Cisco 8861 can't download template over VPN.

cajones
Level 1
Level 1

We have noticed that when we place 8861 phones behind a VPN router the phones can no longer download templates or changes.  They work just fine otherwise.   It does not appear to be a port blocking issue so we are wondering if it might be related to MTU size.  On call manager it says it can't access TFTP but we have 69 udp and tcp open.  Has anyone experienced this?  Any ideas on what we can try?

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