Here is a really great article about Echo Cancellation etc. for Cisco Gateways.
http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/EA_ISD.html
Here is a really great article about Echo Cancellation etc. for Cisco Gateways.
http://www.cisco.com/en/US/docs/ios/solutions_docs/voip_solutions/EA_ISD.html