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CallManager H.323: One-way Voice Issue after Transfer …
https://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/8604-oneway-voice-after-transfer.html
Introduction. This document describes the scenario in which a user gets one way audio issue with Cisco CallManager after a call is transferred or placed on hold, if the H.323 endpoint that is configured on the CallManager is a Fast Ethernet subinterface of the gateway. This occurs especially when the Music on Hold (MOH) is enabled.
h.323 - one way audio scenario - Stack Overflow
https://stackoverflow.com/questions/9820592/one-way-audio-scenario
The calling device will offer one or more channels (usually different voice codecs) and the called device can accept whatever channel(s) are appropriate. Usually, there is a forward and reverse logical channel proposed and accepted, though a called device is not obligated to accept both directions.
Troubleshooting One Way Voice Issues
https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/5219-fix-1way-voice.pdf
cause one way voice issues for ICT configurations. Bind the H.323 Signaling to a Specific IP Address on the Cisco IOS Gateway and Routers When the Cisco IOS gateway has multiple active IP interfaces, some of the H.323 signaling may be sourced from one IP address and other parts of it may reference a different source address. This can generate various
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