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

Delivery Time: 0-3 days

Brand Yeastar

Model Number S412

UPC 4005579205999

EpicRise Warranty 1 Year

Product Highlights

• Supports up to 20 users (analog and VoIP) with 8 concurrent calls for growing small businesses

• Modular design with 4 slots: Slot 1-2 for FXS extensions, Slot 3 for all trunk types, Slot 4 for FXO/BRI/GSM/3G trunks

• 50+ PBX features including IVR, call recording, conferencing, and fax-to-email at no extra licensing cost

• Auto-provisioning for Yealink, Cisco, Polycom, and other major phone brands reduces IT deployment time

• Free lifetime firmware upgrades and remote management capabilities lower long-term maintenance costs

Overview
Specifications
FAQ
User Guides
Reviews

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

Product Details
Color	Black, Multicolor
Power Source	DC-powered

What type of business environment is the Yeastar S412 best suited for?

The S412 is designed for small businesses with 10-20 employees requiring professional phone system capabilities. It serves single offices needing cost-effective unified communications, branch locations requiring PSTN backup alongside VoIP, and organizations transitioning from analog to IP telephony. The 8-concurrent-call capacity handles typical small office call volumes with headroom for growth.

How does the S412 compare to other models in the Yeastar S-Series?

The S412 sits in the entry tier of the S-Series, supporting 20 users versus the S20's 10 users or the S50's 50 users. It offers modular expansion through 4 slots while maintaining affordability for small deployments. Choose the S412 when you need more capacity than the S20 provides but don't require the S50's scale, or when modular flexibility for analog/BRI interfaces is essential.

Is the Yeastar S412 worth the investment compared to cloud-hosted PBX services?

The S412 eliminates recurring per-user fees that cloud services charge, typically achieving ROI within 12-24 months for 15+ users. It includes 50+ features at no additional licensing cost and provides free lifetime firmware upgrades. Organizations requiring on-premises control, PSTN redundancy, or fax machine integration benefit from the S412's one-time hardware investment versus ongoing cloud subscription costs.

What phone systems, trunks, and network equipment is the S412 compatible with?

The S412 auto-provisions desk phones from Yealink, Cisco, Polycom, Snom, and Panasonic, and works with any standard SIP phone. It connects to SIP trunk providers, analog PSTN lines via FXO modules, ISDN BRI circuits, and GSM/3G/4G networks through optional modules. Standard 10/100 Ethernet networks are supported with VLAN, VPN, and QoS compatibility for enterprise network integration.

Can the S412 support both analog phones and modern VoIP endpoints simultaneously?

Yes, the S412 provides 8 built-in FXS ports for analog phones and supports up to 20 users total (analog and VoIP combined). You can add 4 more FXS ports via S2 modules for a total of 12 analog extensions. This hybrid capability lets you preserve existing analog phone investments while gradually transitioning to SIP desk phones and softclients across your user base.

What module combinations can be installed in the S412's 4 expansion slots?

Slots 1 and 2 accept only S2 modules (adding 2 FXS ports each). Slot 3 accepts O2 (FXO), B2 (BRI), GSM, 3G, or 4G LTE modules. Slot 4 accepts O2, B2, GSM, or 3G modules but does not support 4G LTE. You can mix modules to match your trunk requirements, such as combining 2 FXO ports with 1 BRI interface and 1 GSM channel.

Does the S412 require licensing fees for features like call recording or mobile apps?

No, all 50+ PBX features including IVR, call recording, conferencing, call queues, and fax-to-email are included without per-feature licensing. The Linkus UC mobile and desktop clients are also included. Firmware upgrades are free for the lifetime of the device. Only optional App Center applications like advanced billing or hotel modules may require separate purchases.

How is the S412 managed and can it be administered remotely?

The S412 includes a web-based GUI accessible via standard browsers for local administration. Yeastar's cloud-based remote management platform allows secure access from any location for monitoring, configuration changes, and troubleshooting. This centralized management capability is particularly valuable for IT teams supporting multiple branch offices or resellers managing client systems.

What network security features does the S412 provide to prevent toll fraud?

The S412 includes a built-in firewall, IP blacklisting, fail2ban intrusion prevention, and support for TLS/SRTP encrypted signaling and media. It offers VPN server capability for secure remote extensions and static NAT configuration for complex network environments. Geographic call restrictions and time-based routing rules add additional protection against unauthorized usage.

Can the S412 integrate with CRM systems or other business applications?

The S412 supports integration through its App Center architecture and provides API access for custom development. LDAP integration enables directory synchronization with Active Directory or other directory services. While specific CRM integrations depend on third-party applications or custom development, the system provides CTI (computer-telephony integration) capabilities through its API and Linkus client interfaces.