does it come with the gsm module or should that be bought separately?

Here is an S20 with 1 Channel GSM Port, https://www.amazon.com/YeaStar-S20-S20-001-VoIP-Skype/dp/B01K8VJPEW/ref=sr_1_1?ie=UTF8&qid=1488512054&sr=8-1&keywords=Yeastar+S20-001

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S20 S20-000 VoIP SIP IP PBX 20 Ext IVR VM Skype 0 FXS 0 FXO 0 GSM

S20 S20-000 VoIP SIP IP PBX 20 Ext IVR VM Skype 0 FXS 0 FXO 0 GSM

Product ID: 361149539

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Details

Brand
YEASTAR
Internet service provider
AT&T Comcast
Connectivity technology
Ethernet
Compatible devices
Cisco Yealink
Colour
Black

📞20 Extensions

🔄10 Concurrent Calls

🔌Expandable Modules

Description

📈 Elevate Your Communication Game!

EXPANDABLE OPTIONS - Easily expand your system with optional FXS, FXO, and GSM modules to fit your growing needs.
SEAMLESS CONNECTIVITY - Register up to 20 extensions for a fully integrated communication experience.
VERSATILE COMPATIBILITY - Works with all standard SIP phones, including top brands like Cisco and Yealink.
CONCURRENT CALL HANDLING - Effortlessly manage up to 10 concurrent calls, ensuring your team stays connected.
OFFICIAL WARRANTY ASSURANCE - Enjoy peace of mind with the official Yeastar warranty on all orders through 'citiCALLS'.

The Yeastar S20 S20-000 VoIP SIP IP PBX is a robust communication solution designed for modern businesses, allowing registration of up to 20 extensions and handling 10 concurrent calls. Its compatibility with standard SIP phones and expandable modules make it a versatile choice for any professional environment.

Specifications

Compatible Devices	Personal Computer, Router, Laptop, Smartphone
Number of Ethernet Ports	1
Connectivity Technology	Ethernet

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€ 476.21

Duties & taxes incl.

Netherlandsstore

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TrustScore 4.5 | 7,300+ reviews