Dinstar UC120-2O 2FXO VOIP PBX system

The Dinstar UC120-2O 2FXO is an 2-port FXS analog VoIP gateway designed to connect legacy analog phones, fax machines, and PBX extensions to modern IP-based telephony (VoIP/SIP) networks. It bridges traditional telephony devices with IP telephony systems like IP PBXs, softswitches, and SIP servers — making it ideal for businesses, SOHO, call centers, and multi-site deployments.

Core Design & Ports

• 2 FXS ports with RJ11 connectors — supports analog telephones and fax machines.

• Ethernet: 1 × WAN + 2 × LAN (10/100 Mbps RJ-45).

• Compact, rack-or desk-friendly design with industry-standard dimensions and ~1 kg weight.

Network & Protocol Support

• SIP v2.0 compatible with UDP/TCP/TLS for secure VoIP signaling.

• IPv4 & IPv6 Dual Stack support for modern networks.

• Works with IMS/NGN platforms, IP PBXs, softswitches, and SIP servers.

• QoS support with 802.1P/Q VLAN tagging & L3 DiffServ for voice traffic prioritization.

Voice & Fax Capabilities

• T.38 Fax over IP and fax pass-through for reliable faxing over SIP networks.

• Multiple voice codecs: G.711 A/U, G.723.1, G.729A/B, AMR, G.726, optional Opus, iLBC.

• Echo cancellation (G.168) up to 128 ms, jitter buffer, VAD, CNG, gain control.

• Supports DTMF (RFC2833, SIP INFO, in-band) and both DTMF/Pulse dialing.

Telephony Features

• Speed dial, call hold, call waiting, call forward (busy/no reply/unconditional).

• 3-way conference, blind/attended transfer, do-not-disturb (DND), voicemail/document (MWI).

• Flexible dial plans and routing rules.

Management & Security

• Web, Telnet, TR-069 & SNMP remote management.

• Auto provisioning, firmware upgrade via HTTP/HTTPS, config backup/restore.

• TLS/SRTP encryption for secure SIP signaling and media.

• System logs, CDR export, and cloud-based support options possible.

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Practical Use Cases

Business Telephony Integration

Great for small and medium offices that need to connect legacy analog phones to an IP PBX or hosted VoIP service without replacing old hardware.

Call Centers

Supports multiple analog extensions while centralizing call control on SIP trunks or softswitch platforms.

Fax & POS Connectivity

Reliable fax services over IP using T.38, plus support for POS terminals or modem-based equipment.

Multi-Branch Setup

Deploy analog lines across remote offices with unified SIP management and provisioning.

Frequently Asked Questions

1. What is the Dinstar UC120‑2O used for?
   It connects two analog PSTN phone lines to a SIP VoIP telephone system.

2. How many phone lines can it support?
   It supports up to 2 PSTN/analog phone lines.

3. Does it work with VoIP PBX systems?
   Yes, it is compatible with SIP PBXs like Grandstream, Yeastar and others.

4. Can it handle fax over IP?
   Yes, it supports T.38 fax over IP and fax pass‑through.

5. What network interface does it use?
   It uses a 10/100 Mbps Ethernet LAN port for network connection.

 

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