To resolve analog recEive and transMit (E&M) issues with Cisco IOS Software based platforms, perform these steps:
Verify that your Cisco platform supports analog E&M voice ports.
Refer to Cisco IOS Software and hardware support for analog E&M on a MC3810 multiservice access concentrator
For more information on these steps, refer to Analog E&M Troubleshooting Guidelines (Cisco IOS Platforms).
For more information, refer to these documents: