Can I use a sim card in this model

This model does not support the use of a SIM card. You would need an upstream router with SIM support to use a SIM card FTTech

Any grand stream models to recommend for 50 users only

Grandstream specs for the UCM6301 PBX show: Users: 500 Concurrent calls (G.711): 75 Max concurrent SRTP calls (G.711): 50 This PBX should work for 50 users without any issues. Thanks, FTTech

.I have 6 incoming phone lines but this system has 2 fxs ports could use any adapter or card on this device to have my 6 land phone lines attached ?

in case you need attach 8 phones to your system, you need to find the fxs adaters, most of them 2 ports for 8 phones you need 4 adapters, some come with 8 ports.

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📞 Elevate your office calls with the powerhouse IP PBX that means business.

RELIABLE SECURE - Built to ensure uninterrupted communication with robust security protocols.
COMPACT LIGHTWEIGHT - At just 1.2 lbs, it fits effortlessly into any modern workspace without clutter.
SCALABLE CONNECTIVITY - Supports multiple extensions and SIP trunks to grow with your business needs.
SEAMLESS NETWORK INTEGRATION - Easily integrates with existing network infrastructure for smooth deployment.
ENTERPRISE GRADE COMMUNICATION - Power your office with crystal-clear VoIP calls and advanced telephony features.

The Grandstream UCM6301 is a compact, lightweight IP PBX system designed for professional environments, delivering high-performance VoIP communication with scalable connectivity and seamless network integration.