Source note · Troubleshooting Cisco IP phone registration
On a Catalyst 9300 the voice VLAN is set per access port with switchport voice vlan vlan-id, CDP must be enabled on the port to send that configuration to the phone, and show interfaces interface-id switchport displays it.
Checked 2026-09-24
You must enable CDP on the device port connected to the Cisco IP Phone to send the configuration to the phone
- Vendor
- Cisco
- Product
- Catalyst 9300 (IOS XE)
- Subsystem
- voice VLAN
- Deployment
- on-premises
- Region
- not restricted
- Release range
- IOS XE 17.15.x
- Checked
- 2026-09-24
Sources
- VLAN Configuration Guide, Cisco IOS XE 17.15.x (Catalyst 9300 Switches) - Configuring Voice VLANs — Cisco Systems · tier 2 current vendor documentation · Configuring Voice VLANs > Configuring a Voice VLAN / Monitoring Voice VLAN
Cite this note
APA
WarmTransfer. (2026, September 24). Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-sw-voice-vlan. WarmTransfer. https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-sw-voice-vlan
BibTeX
@misc{warmtransfer-claim-cisco-phone-registration-troubleshooting-sw-voice-vlan,
title = {Troubleshooting Cisco IP phone registration: source note cisco-phone-registration-troubleshooting-sw-voice-vlan},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cisco-phone-registration-troubleshooting-sw-voice-vlan},
note = {Source note cisco-phone-registration-troubleshooting-sw-voice-vlan, checked 2026-09-24}
}