[asterisk-users] When to use Echo Cancellation cards?

[Zeeshan Zakaria]

In what scenarios non-Echo Cancellation cards (T1/E1/FXO) should be used ?
Don't all good and professional installations need echo cancellation cards?
Are there people out there with non-Echo Cancellation cards for T1 or 8 FXO
ports and who really don't have any echo issues and they are running serious
businesses?

-- 
Zeeshan A Zakaria
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