Cisco 8861 Administration Guide

https://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
Verify DNS Settings
Procedure
Step 1 Select Admin Settings > Network Setup > Ethernet Setup > IPv4 Setup
Step 2 Check that the DNS Server 1 field is set correctly.
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 8800 Series Multiplatform Phones Administration Guide
361
Cisco IP Phone Troubleshooting
Verify DNS Settings

Cisco 8861 Specifications

General

Resolution	800 x 480 pixels
Audio	Wideband audio
Ethernet Ports	2 x 10/100/1000
Speakerphone	Full-duplex
Display	5-inch color display
Lines	5
PoE	Yes (802.3af)
Protocols	SIP, SDP, SRTP
Wi-Fi	802.11a/b/g/n/ac
Headset Jack	Yes
Codecs	G.711, G.722, G.729, iLBC
USB Port	2 x USB 2.0
USB Ports	2 x USB 2.0
Supported Languages	Multiple (English, French, Spanish, etc.)