Is this headset compatible with Cisco CP 8851 model phones?

Definitely works with Cisco IP 7942. Has 2 cords enclosed for more compatiblility, but dont know about ur specific model.

I have a grandstream phone - model #gxp-1625. will this work on this phone?

Hi, No, this headset does not work on Grandstream GXP 1625, you can check the item https://www.amazon.com/dp/B07D4G8SNC?ref=myi_title_dp, this headset works on Grandstream GXP 1625.

ASIN	B07VJL7BH5
Age Range (Description)	Adult
Audio Driver Type	Dynamic Driver
Best Sellers Rank	#24 in Telephone Headsets
Cable Feature	Retractable
Compatible Devices	Compatible with Cisco phone CP-7821, 7861, 7960G, 7975G, 8811, 9971 etc, Telephones
Connectivity Technology	Wired
Control Method	Touch
Control Type	Noise Control
Customer Reviews	4.4 4.4 out of 5 stars (351)
Date First Available	July 23, 2019
Earpiece Shape	rounded
Headphones Jack	RJ9 Jack
Included Components	Cable, User Manual
Input Device Interface	RJ9
Item Weight	7.7 ounces
Item model number	MKJ810QD002C
Manufacturer	Meikajia
Material	Plastic, Polyurethane (PU)
Model Name	MKJ810QD002C
Noise Control Features	noise_cancellation
Number of Items	1
Product Dimensions	5.31 x 6.69 x 1.57 inches
Recommended Uses For Product	Calling
Series Number	81
Special Feature	Adjustable Headband, Lightweight, Microphone Included, Noise Cancellation
Specific Uses For Product	call center home office business phone calls, office phone headset with microphone noise canceling
Style	Office Phone Headset with Mic
Supports Bluetooth Technology	No
UPC	657390958130
Units	1 Count
Water Resistance Level	Not Water Resistant
Wireless Communication Technology	Wired Headphone with Microphone

Cisco Phone Headset Corded RJ9 Telephone Headset with Noise Cancelling Microphone for Cisco CP-7821 7841 7942G 7931G 7940 7941G 7945G 7960 7961G 7962G 7965G 7975G 8811 8841 8861 9951 9971

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