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An echo is heard on IP phones when calls are placed between IP phones and the PSTN through the AS5300 IOS gateway
A test bed was established which consisted of the AS5300 gateway with C542 and C549 Digital Signal Processors (DSPs), DSPware11.32, and Cisco IOS 12.3.17(b).
Calls were made from the Session Initiation Protocol (SIP) network to the Public Switched Telephone Network (PSTN) through the AS5300 gateways, and echo canceling information was collected from sniffer traces on the E1 port on the gateway. Tests showed G165 echo cancellation performed better when compared to G168.