Yeastar S20 IP PBX – 20 Users with 4 FXO Ports

Key Features:

• 20 Users Supported: Designed for small offices and departments.

• 10 Concurrent Calls: Handles multiple simultaneous calls efficiently.

• Up to 4 FXO/BRI Ports: Expandable analog PSTN connectivity (e.g., with O2 Module) for up to 4 FXO ports.

• Modular Expansion: Two onboard module slots support combinations of FXS, FXO, ISDN BRI, and GSM/3G/4G modules.

• SIP Trunk Support: Up to 20 VoIP trunks for carrier connectivity.

• Built‑in Voice Features: IVR, call routing, call recording, voicemail, conferencing, queueing, paging, follow‑me, fax‑to‑email, and more.

• Security & Network: Internal firewall, VPN, VLAN, QoS, TLS/SRTP encryption, and DDNS support.

• Linkus Unified Communications: Integrates desktop and mobile softphones for flexible communication.

• Remote Management: Configure and monitor system securely via web UI from anywhere.

Hardware & Technical Specs:

• Users: 20 users (SIP accounts).

• Concurrent Calls: 10 simultaneous calls.

• Modular Ports:

  • Up to 4 FXS/FXO/BRI ports (supporting analog PSTN via FXO modules).

  • Up to 1 GSM/3G/4G channel (with respective module).

• VoIP Trunks: 20 simultaneous SIP trunks.

• Protocol Support: SIP (RFC3261), IAX2.

• Transport: UDP, TCP, TLS, SRTP.

• Audio Codecs: G.711 (alaw/ulaw), G.722, G.726, G.729A, GSM, Speex, ADPCM, iLBC.

• Ethernet: 2 × 10/100 Mbps LAN/WAN.

• Fax Support: T.38 Fax‑over‑IP.

• Firewall & Security: Integrated firewall with VPN, NAT, VLAN.

• Power: DC 12V 1A.

• Dimensions: Approx. 16 × 16 × 3 cm; desktop or wall‑mount.

• Environmental: 0°C to 40°C operating range.