Troubleshoot One Way Audio Issue Using CLI Debug Outputs from Cisco IP Phone 7800/8800 Series

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/support/docs/collaboration-endpoints/ip-phone-7800-series/200903-Troubleshoot-One-Way-Audio-Issue-Using-C.html

Published

2018-09-11

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• In Cisco's 7800/8800 phone debug method, stream statistics showing Rx Count=0 while the encoder reports packets sent mean the phone transmitted but received no RTP. That confirms a one-way failure in the phone's receive direction. in context
• In the same phone debug output, separate START RX and START TX log lines, each with the remote IPv4 address and codec, show whether the phone opened each direction of the stream and which address it is using. in context

Cite this source record

APA

WarmTransfer. (2018, September 11). Troubleshoot One Way Audio Issue Using CLI Debug Outputs from Cisco IP Phone 7800/8800 Series. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-technote-200903-7800-one-way-audio-debug

BibTeX

@misc{warmtransfer-cisco-technote-200903-7800-one-way-audio-debug,
  title  = {Troubleshoot One Way Audio Issue Using CLI Debug Outputs from Cisco IP Phone 7800/8800 Series},
  author = {{WarmTransfer}},
  year   = {2018},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-technote-200903-7800-one-way-audio-debug},
  note   = {Cisco Systems, accessed 2026-09-24}
}