do we need to buy a license for this phone to utilize it? user connect license

I think it does require a license. I'm not sure which license is required, but your service provider should know what you need to operate this phone.I got this info of Cisco website:Phone licensing depends on the call-control platform and its policies. For the Cisco Unified Communications Manager, the Cisco Unified SIP Phone 3905 requires appropriate User Connect Licensing (UCL). There are no special license-plus-phone bundles for tier 2 distributors. The phone is not supported on third-party call-control systems.

good afternoon, includes the power source?

No. The one I received did not include the power supply

How many ports/interfaces does this phone have? 1 for handset and 1 for a headset? if 2 ports, what type? rj9, rj11 or usb?

One Network port, one computer port, one DCA2V, and one handset port. This type of phone has been installed in schools in classrooms.

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Unified SIP Phone 3905, Charcoal, Standard Handset

Product ID: 56791199

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Details

Brand
Cisco
Colour
Black
Telephone type
Corded
Number of batteries
Product
Material
unspecified
Power source
Corded

🌿Eco-friendly recycled plastics

📞2-line display for multitasking

🔌Dual-port 10/100 Ethernet switch

Description

📞 Elevate your desk game with smart, sustainable calls!

ECO CONSCIOUS DESIGN - Built with reground and recyclable plastics for a greener office footprint.
VERSATILE DEPLOYMENT - Perfect for cubicles, retail, classrooms, manufacturing floors, and wall-mounted setups.
SEAMLESS MULTITASKING - Supports two calls per line with intuitive fixed keys for redial, transfer, and hold/resume.
PLUG PLAY EFFICIENCY - Dual-port Ethernet switch reduces cabling clutter and streamlines your workspace setup.
BUDGET SAVVY COMMUNICATION - Entry-level IP phone delivering essential Cisco unified communications without breaking the bank.

The Cisco Unified SIP Phone 3905 is a cost-effective, entry-level IP phone featuring a two-line display, full-duplex speakerphone, and dual-port 10/100 Ethernet switch. Designed for versatile environments, it supports two simultaneous calls per line and offers fixed keys for essential call functions. Its eco-friendly construction uses recycled plastics, making it a smart, sustainable choice for professional communication.

Specifications

Conference Call Capability	2 way
Phone Talk Time	1 Hours
Is there Caller ID	Yes
Multiline Operation	Single-Line Operation
Dialer Type	Manual Keypad
Answering System Type	Digital
Compatible Devices	[VARIOUS]
Number of Batteries	9V batteries required.
Power Source	Corded Electric
Item Weight	1.31 Pounds
Item Dimensions	10.3 x 8.7 x 2.4 inches
Material Type	unspecified
Color	Black

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