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How to resolve the one-way audio issue when Cisco ...
https://community.cisco.com/t5/collaboration-voice-and-video/how-to-resolve-the-one-way-audio-issue-when-cisco-callmanager/ta-p/3132086#:~:text=If%20GRE%20is%20not%20used%2C%20calls%20from%20remote,GRE%2FIPsec%20tunnel%2C%20the%20ephone%20routes%20through%20the%20tunnel.
How to resolve the one-way audio issue when Cisco ...
https://community.cisco.com/t5/collaboration-voice-and-video/how-to-resolve-the-one-way-audio-issue-when-cisco-callmanager/ta-p/3132086
If GRE is not used, calls from remote phones to the Public Switched Telephone Network (PSTN) or Cisco Unity Express receive one-way audio. If you have the IP phone (ephone) attached to Cisco CallManager Express over IPSec, and the remote router or VPN client is attached through a GRE/IPsec tunnel, the ephone routes through the tunnel.
How to troubleshoot one-way / no audio issues - Cisco ...
https://community.cisco.com/t5/collaboration-voice-and-video/how-to-troubleshoot-one-way-no-audio-issues/ta-p/3164442
This example shows a one-way audio, the call flow is SIP phone calls an SCCP phone . SIP phone relevant info is marked in blue. SCCP phone relevant info is marked in orange . Since CUCM sends the correct IP address and port to each phone, this is …
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