Polycom OBI 508 Voice Adapter 8 FXS ATA

Polycom OBI 508 – 8‑Port FXS Analog Telephone Adapter

The Polycom OBI 508 is a powerful 8‑port FXS analog telephone adapter (ATA) that connects traditional analog phones, fax machines, and analog PBX systems to modern VoIP networks. Ideal for small to medium businesses, hotels, or multi‑line home offices, the OBI 508 supports up to 8 independent analog devices, each with its own phone number and SIP account. With advanced voice quality, failover capabilities, and remote management, this ATA is a reliable bridge between old and new communication technologies.

How It Works

The OBI 508 connects to your network via Ethernet (RJ‑45) and to up to 8 analog devices (phones, fax, modems) using standard RJ‑11 ports. It registers with a SIP‑based VoIP service provider (like Asterisk, BroadSoft, or any cloud PBX) or can be used peer‑to‑peer. Each of the 8 ports functions as an independent line with its own extension or phone number. The device supports G.711 and G.729 codecs, fax over IP (T.38), caller ID, call waiting, three‑way calling, and programmable digit maps. The built‑in web interface makes configuration easy. For a complete VoIP solution, pair this adapter with professional VoIP headsets from FindHeadsets, ensuring crystal‑clear audio at your desk.

Compatibility & Design

The Polycom OBI 508 works with any SIP‑based VoIP service, including Vonage, RingCentral, 8x8, Nextiva, and open‑source platforms like FreePBX. It is compatible with most analog phones, cordless phones, and fax machines. The device is housed in a compact metal or plastic chassis (approx. 8 x 5 x 1.5 inches) with LED indicators for power, network, and line status. It includes a 12V DC power adapter, an Ethernet cable, and rubber feet for desktop placement. The OBI 508 also supports TR‑069 for remote provisioning. Firmware updates are available via Polycom support.

Why Choose This Product

The OBI 508 is one of the few affordable 8‑port ATAs on the market, making it perfect for businesses that want to keep their existing analog phones while switching to VoIP. Instead of buying expensive IP phones for every desk, you can connect standard analog phones to the OBI 508. The 8‑port density saves rack space and reduces cabling. Features like failover to PSTN (using an optional FXO port, depending on variant), T.38 fax support, and advanced dial plans give you flexibility. For IT managers, remote management tools simplify maintenance. By choosing this adapter, you extend the life of your analog devices while enjoying the cost savings and features of VoIP.