Cisco 8865 Series Administration Guide

See the Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks document,
available at this URL:
https://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
Verify DNS Settings
Procedure
Step 1 On the phone, press Applications .
Step 2 Select Admin Settings > Network Setup > IPv4 Setup
Step 3 Check that the DNS Server 1 field is set correctly.
Step 4 You should also verify that a CNAME entry was made in the DNS server for the TFTP server and for the
Third-Party Call Control.
You must also ensure that DNS is configured to do reverse lookups.
Additional Troubleshooting Information
If you have additional questions about troubleshooting your phone, go to the following Cisco website and
navigate to the desired phone model:
https://www.cisco.com/cisco/web/psa/troubleshoot.html
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
318
Cisco IP Phone Troubleshooting
Verify DNS Settings

Cisco 8865 Series Specifications

General

Resolution	800 x 480 pixels
Speakerphone	Full-duplex speakerphone
Codec Support	G.711, G.722, G.729, iLBC, Opus
Audio	Wideband audio
Ethernet	10/100/1000 Mbps
USB Ports	2 USB ports
Video	720p HD video
Power	IEEE 802.3af/at Power over Ethernet (PoE)
Protocols	SIP
Headset Connector	RJ9 headset port
Security	802.1X, TLS, SRTP
Weight	1.6 kg