Source note · One-way and no-way audio diagnosis
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.
Checked 2026-09-24
- 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, final stream statistics
Cite this note
APA
WarmTransfer. (2026, September 24). One-way and no-way audio diagnosis: source note one-way-audio-phone-rx-count-zero. WarmTransfer. https://warmtransfer.net/knowledge/claims/one-way-audio-phone-rx-count-zero
BibTeX
@misc{warmtransfer-claim-one-way-audio-phone-rx-count-zero,
title = {One-way and no-way audio diagnosis: source note one-way-audio-phone-rx-count-zero},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/one-way-audio-phone-rx-count-zero},
note = {Source note one-way-audio-phone-rx-count-zero, checked 2026-09-24}
}