Does voip work if I have poor internet reception?

Your internet has nothing to do with it. VoIP is is how you connect and talk on your local network

the CP-7821 is unable to setup. can you please tell me if its unlocked?

Hello Hossain, What call control system you're using to configure the phone? Make sure it is on of the following supported by the 7800 series phones: - Cisco Unified Communications Manager - Cisco Business Edition 6000 - Cisco Hosted Collaboration Solution - Cisco Unified Survivable Remote Site Telephony Thanks

do you have smartnet for this phone? price smartnet?

This phone is SMARTnet eligible but I do not have SMARTnet. I think it's $5-8 per phone for SMARTnet though.

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Cisco IP Telephony Solutions CP-7821-K9= [保守購入必須)Cisco UP Phone 7821]

Cisco IP Telephony Solutions CP-7821-K9= [保守購入必須)Cisco UP Phone 7821]

Product ID: 733536862

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Details

Brand
Cisco
Color
Black
Telephone Type
Corded
Number of Batteries
1 Lithium Ion
Material
Plastic
Power Source
Corded

⚡Lightweight 1.12 kg design

📞3.5-inch vibrant display

🖤Sleek black professional finish

Description

📞 Elevate your office calls with Cisco’s sleek, smart IP phone — because your team deserves the best.

SEAMLESS INTEGRATION - Designed to integrate smoothly with your existing Cisco infrastructure for hassle-free deployment.
COMPACT LIGHTWEIGHT - At just 1.12 kg, this phone fits seamlessly into any modern workspace without bulk.
INTUITIVE 3 5 INCH DISPLAY - Navigate calls and features effortlessly on a bright, easy-to-read screen.
CRYSTAL CLEAR COMMUNICATION - Experience sharp, reliable voice clarity with Cisco’s trusted IP telephony technology.
ENTERPRISE GRADE RELIABILITY - Built by Cisco Systems, a leader in enterprise communications since 2013.

The Cisco CP-7821-K9 is a professional-grade IP phone featuring a 3.5-inch display, lightweight 1.12 kg design, and a sleek black finish. Manufactured by Cisco Systems in 2013, it offers reliable, enterprise-level telephony solutions ideal for modern office environments.

Specifications

Display Size	3.5
Color Name	Black
Batteries Included	No
Batteries Required	No
Brand	Cisco
Manufacturer	CISCO SYSTEMS - ENTERPRISE
Item Model Number	CP-7821-K9
Model Year	2013
Material	Plastic
Product Dimensions	27.94 x 7.62 x 30.48 cm; 1.12 kg
Item Weight	1.12 Kilograms

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