Can't say that I have heard of echo problems when older 18D sets are used in conjunction with the R7 processor.
Some questions about the setup to help get us started on the path to a resolution.
Is the handsfree system being used when echo is heard?
Is the echo being experienced on local and long distance calls?
Is echo being heard on both incoming and outgoing calls?
POTs lines or a T1 being used?
What cards are being used in the system in question?
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