According to Wikipedia it stands for Session Initiation Protocol which allows coordination between mobile devices and the VOIP system. Haven't used it so I have no further comment.

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Grandstream Grandstream DP750 Long-range DECT Base Station + DP720 2-UNITS DECT HD Handset

Q: Can you use this with Google voice?

No this is a sip based up phone.

Q: Is it compatible with Optimum phone service?

I'm not familiar with Optimum phone service. If Optimum is SIP and Optimum will give you the credentials, then it should work. Ask optimum if they support the use of third party (customer owned and provisioned) endpoint equipment.

Product ID: 413915638

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Details

Brand
Grandstream
Colour
Black
Telephone type
Cordless
Number of batteries
2 Unknown
Material
Plastic

📞Supports 10 SIP accounts

📶Up to 5 handsets per base

🔊Full HD audio clarity

Frequently Bought Together

Grandstream DP750 Long-range DECT Base Station + DP720 2-UNITS DECT HD Handset

Grandstream DP720 Dect Cordless VoIP Telephone,Black

Grandstream GXP2170 IP Phone | 12 Lines, 6 SIP Accounts | 4.3-Inch Color Display | Dual-Port Gigabit Ethernet with Integrated PoE

Description

📞 Stay Connected, Stay Ahead – The Ultimate Cordless VoIP Experience

GLOBAL READY - Multi-language support and headset jack for versatile, on-the-go communication
PLUG PLAY WITH PO E - Integrated Power over Ethernet simplifies setup and reduces cable clutter
MULTI USER POWERHOUSE - Supports up to 5 handsets and 10 SIP accounts for ultimate connectivity
CRYSTAL CLEAR CONVERSATIONS - Full HD audio and 3-way conferencing keep your calls sharp and professional
SEAMLESS MOBILITY EVERYWHERE - Cordless DECT solution perfect for business, warehouse, retail, or home environments

The Grandstream DP750 DECT Base Station paired with two DP720 handsets delivers a robust cordless VoIP solution supporting up to 5 handsets, 10 SIP accounts, and 4 concurrent calls. Featuring full HD audio, 3-way conferencing, PoE integration, and multi-language support, it’s designed to empower businesses and homes with seamless, high-quality communication mobility.

Specifications

Conference Call Capability	3 way
Phone Talk Time	6 Hours
Is there Caller ID	No
Dialer Type	Dual Keypad
Answering System Type	Digital
Number of Batteries	2 Unknown batteries required.
Power Source	Corded Electric
Item Weight	3 Pounds
Color	Black

Have a Question? See What Others Asked

Can you use this with Google voice?

What is sip?

Does the deck and wireless phones come with a power supply?

Is it compatible with Optimum phone service?

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