QoS Layer 2 Overhead

Im really confused when it comes to calculating bandwidth requirement.

According to the QoS SRND - FrameRelay adds 4 bytes overhead.

According to his blog post here

http://blog.ine.com/2008/10/17/computing-voip-traffic-bandwidth-consumption/#more-298

it adds 7. That's almost twice the overhead and im afraid i might run out of the 10% margin of error that i read that is acceptable.

What should i do?

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