Yeastar S412 VoIP PBX System - 20 Users, 8 Concurrent Calls, Modular Design for Small Business

The Yeastar S412 VoIP PBX delivers a future-ready unified communications solution that combines advanced VoIP technology with robust analog capacity. Designed for small businesses and branch offices, the S412 handles up to 20 users and 8 concurrent calls while offering exceptional flexibility through its modular architecture. Enterprise IT decision-makers choose the S412 to consolidate communication infrastructure, reduce telephony costs, and enable seamless remote work capabilities without sacrificing reliability or feature completeness. Built on an industrial-grade Freescale ARM A9 quad-core processor, the S412 comes pre-configured with 8 fixed FXS ports and 4 modular slots that accommodate various combinations of analog extensions, CO/BRI lines, and cellular interfaces. The system integrates SIP and IAX2 protocols, supports T.38 faxing, and provides automatic phone provisioning for leading manufacturers. With built-in firewall protection, TLS/SRTP encryption, and Yeastar's remote management platform, the S412 delivers enterprise-grade security and centralized administration that scales from single-site deployments to multi-location networks. Best For The Yeastar S412 is engineered for organizations requiring reliable voice communications with room to expand: - Small Business Offices: Companies with 10-20 employees needing professional phone system features like auto-attendant, call queues, and voicemail-to-email without enterprise-level complexity or cost - Branch Office Connectivity: Remote locations requiring integration with corporate VoIP infrastructure while maintaining local PSTN redundancy through analog or BRI trunks - Hybrid Telephony Environments: Businesses transitioning from legacy analog systems to VoIP who need simultaneous support for existing analog phones, fax machines, and modern SIP endpoints - Multi-Site Retail or Service Chains: Organizations managing 3-10 locations that benefit from centralized remote management, standardized configurations, and auto-provisioning capabilities - Cost-Conscious Deployments: IT teams seeking feature-complete PBX functionality including conferencing, call recording, and mobile integration without recurring per-user licensing fees Key Features - Modular Expansion Architecture: 8 built-in FXS ports plus 4 hot-swappable slots: Slot 1 and Slot 2 for S2 modules only, Slot 3 for O2/B2/GSM/3G/4G LTE modules, Slot 4 for O2/B2/GSM/3G modules (no 4G LTE support) - Complete UC Feature Set: Over 50 built-in PBX features including IVR with custom prompts, ring groups, call queues, conference bridging, one-touch call recording, and call detail records - Multi-Protocol Support: Native SIP and IAX2 protocols with support for major VoIP service providers, plus T.38 fax relay and G.711/G.729/G.722 codecs for voice quality optimization - Integrated Security: Hardware firewall, VPN server capability, TLS/SRTP encryption, IP blacklisting, and fail2ban protection defend against toll fraud and unauthorized access - Zero-Touch Phone Provisioning: Automatic configuration for Yealink, Cisco, Polycom, Snom, and Panasonic desk phones eliminates manual setup and enables rapid deployment - Linkus UC Client Integration: Native mobile and desktop softphone apps provide presence, visual voicemail, ad-hoc conferencing, and full PBX feature access from any device - App Center Extensibility: Add-on applications for hotel/hospitality operations, call accounting, LDAP directory integration, and call center analytics extend functionality without system upgrades - Cloud-Based Remote Management: Yeastar's secure remote access platform enables IT teams and resellers to monitor status, update configurations, and troubleshoot systems from any location Quick Specs Specification Value Maximum Users 20 (analog and VoIP combined) Concurrent Calls 8 Fixed FXS Ports 8 Maximum FXS Ports 12 (with S2 modules) Maximum FXO/BRI Ports 4 GSM/3G/4G Channels 2 VoIP Trunks 4 VoIP Protocols SIP (RFC3261), IAX2 Audio Codecs G.711 (alaw/ulaw), G.722, G.726, G.729A, GSM, Speex, ADPCM, iLBC Video Codecs H.263, H.263P, H.264, MPEG4 Fax Support T.38 Ethernet Ports 2 × 10/100 Mbps (WAN + LAN) Network Features Static IP, DHCP, VPN, Firewall, VLAN, DDNS, PPPoE, QoS, STUN Processor Freescale ARM A9 industrial-grade quad-core CPU Voicemail Storage 5000 minutes (expandable) Module Slots 4 total (Slot 1-2 for S2 extension modules only; Slot 3 for O2/BRI/GSM/3G/4G LTE trunk modules; Slot 4 for O2/BRI/GSM/3G trunk modules) Power Supply DC 12V 3.33A Power Consumption 9.0-25.6W Dimensions (W×D×H) 290 × 180 × 33 mm Weight 0.68 kg Operating Temperature 0°C to 40°C (32°F to 104°F) Storage Temperature -20°C to 65°C (-4°F to 149°F) Humidity 10-90% non-condensing Mounting Desktop and wall-mount What's Included - Yeastar S412 VoIP PBX unit - DC 12V 3.33A power adapter - Ethernet cable - 4 rubber feet pads - Warranty card - Quick installation guide