Source note · One-way and no-way audio diagnosis
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.
Checked 2026-09-24
START RX: [mediaType(codec)=4][pkt size=20][remote IPv4=10.62.150.10]
- Vendor
- Cisco
- Product
- IP Phone 7800
- Subsystem
- endpoint diagnostics
- Deployment
- on-premises
- Region
- not restricted
- Release range
- phone firmware sip78xx.10-3-1-12 with Unified CM 11.0.1 as tested
- Checked
- 2026-09-24
Sources
- Troubleshoot One Way Audio Issue Using CLI Debug Outputs from Cisco IP Phone 7800/8800 Series — Cisco Systems · tier 2 current vendor documentation · Technote 200903, Troubleshoot section, RX and TX log lines
Cite this note
APA
WarmTransfer. (2026, September 24). One-way and no-way audio diagnosis: source note one-way-audio-phone-start-rx-tx. WarmTransfer. https://warmtransfer.net/knowledge/claims/one-way-audio-phone-start-rx-tx
BibTeX
@misc{warmtransfer-claim-one-way-audio-phone-start-rx-tx,
title = {One-way and no-way audio diagnosis: source note one-way-audio-phone-start-rx-tx},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/one-way-audio-phone-start-rx-tx},
note = {Source note one-way-audio-phone-start-rx-tx, checked 2026-09-24}
}