Cisco 7861 Administration Guide

To reduce or eliminate any adverse effects to the phones, schedule administrative network tasks during a time
when the phones are not being used or exclude the phones from testing.
Cisco IP Phone 7800 Series Multiplatform Phones Administration Guide
327
Cisco IP Phone Troubleshooting
Phone Behavior During Times of Network Congestion

Cisco 7861 Specifications

General

Speakerphone	Yes
Wall Mountable	Yes
Protocols	SIP
Display	3.5-inch grayscale
PoE	Yes
Audio Codec	G.711, G.729, G.722, iLBC
Headset Port	Yes
Weight	1031 g
Line Keys	16 line keys