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CUCM One-way audio and MTP Problems - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/cucm-one-way-audio-and-mtp-problems/td-p/3031464#:~:text=The%20one-way%20audio%20is%20not%20always%20happening%2C%20its,to%20the%20SIP%20provider%20from%20the%20IP%20Phone.
Experiencing One Way Audio When Connecting via SIP
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000PLooCAG
Experiencing one-way audio when connecting via SIP (Session Initiation Protocol). Environment PAN-OS Cause SIP (Session Initiation Protocol) allows two endpoints to establish media sessions with each other. This is an …
How to punch SIP One Way Audio in the face - UCPros
https://ucpros.net/sip-one-way-audio/
With SIP one-way voice issues, we are usually looking for a specific audio path that can’t reach its destination, thus, we first have to realize which stream we are looking for. If phone A can’t hear phone B, the logic will be to take a look at the source
One way Audio in SIP to SIP Call - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/one-way-audio-in-sip-to-sip-call/td-p/3080596
2. SIP Client on non-cisco SIP Server rings, and when answered, there is only one way audio going backwards. 3. Cisco phone can hear SIP Client but SIP Client cannot hear Cisco phone. I have tried all possible termination configuration, always one way audio. SIP Packets have no occurance of a=inactive or audio=sendonly
How to troubleshoot one-way and no-way audio on VoIP …
http://info.teledynamics.com/blog/how-to-troubleshoot-one-way-and-no-way-audio-on-voip-calls
For more details on how to resolve NAT-related audio issues, see our article on how to resolve one-way or no-way audio on VoIP calls. (2) Firewall. If specific ports within the RTP range are being blocked by the firewall, then the voice stream will be impeded.
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