Our call centers here are currently experiencing some intermittent issues with echo on their phones. I have been researching this, and I understand that this is an issue that is experienced on GW's running IOS 12.4 and DSPWare 4.4.13 or later. I also understand that I can't generate a test tone from the 7961 to measure the ERL. I was wondering if anyone might have some ideas on how to proceed next. Here's what we're running:
IOS Version 12.4(10)
Image Version flash:c3825-ipvoicek9-mz.124-10.bin
Cisco 7961 IP Phones
The doc I was reading (ID 19640: Troubleshooting Echo Problems Between IP Phones and Cisco IOS Gateways) and I was also wondering if the echo coverage can be configured for 64 ms in IOS 12.4(10)
Thanks for any information or assistance.