OBi504 Voice Adapter

Cut your business landline cord and join your voice communication services with the cloud


Polycom OBi504 voice adapter (or commonly called the ATA) is the service provider’s ultimate legacy-phone-to-hosted-voice migration solution. Featuring 4 FXS ports, enable the Polycom OBi504 to carry your VoIP service to premises where multiple phone lines are needed.

Polycom OBi504 also features a Gigabit Ethernet WAN and 3 LAN ports for routing or bridging other network devices, in addition to 3.5mm audio ports for music on-hold and paging capabilities.


Connect up to nine open SIP services


Unparallel reliability with cloud management


Zero-Touch Customization for ease of deployment

Polycom OBi504 allows you to bridge together calls from 9 SIP services, and 1 OBiTALK voice service. All 9 SIP services have highly configurable call routing rules for advanced telephony functions such as hunt groups, SIP trunking, hotlines, paging and more

For a hosted voice service provider who places service reliability as first priority, let Polycom’s cloud-managed devices get you covered. With available native monitoring tools and device management APIs, allow the OBi504 carrying your voice service to actively report whenever a device loses registration or connection. It’s a service provider NOC’s dream come true!

Born in the cloud, the OBi504 can automatically pre-load your configurations from the Polycom cloud during its first bootup, enabling a true zero-touch deployment. Available configuration customization to bootstrap network and provisioning parameters upon installation and day-2 deployment

Full-featured VoIP

Simplify your VoIP experience with OBi504. Enjoy all of its features, including:

  • Service-dependent fax support (includes T.38 support for high reliability)
  • Caller ID
  • Telemarketer blocking
  • 3-way conference calling
  • Do not disturb
  • Blacklisting

Polycom Device Management Services – for Service Providers (PDMS-SP)

Are you a service provider? Learn more about our cloud-management tools to help you reduce service deployment pains.

What’s required to make it work?

  • Active internet connection
  • Analog touch-tone phone, fax machine or alarm panel
  • (Optional) Active internet phone service subscription with all required SIP credentials to make and receive calls

Physical Attributes

  • 27 cm x 16.5 cm x 4.5 cm – 10.6 in x 6.5 in x 1.8 in
  • Unit Weight: 1.25 kg – 2.76 lbs
  • Packaging Weight: 1.53 kg – 3.36 lbs

What’s included in the box:

  • OBi504 voice service bridge and telephone adapter
  • Power adapter
  • Rack Mount
  • 1 x RJ-45 Ethernet cable (80 inches / 203 centimeters)
  • OBi504 Quick Reference Guide

What are the connections?

  • Internet (WAN): 1 x 10/100/1000 BaseT Ethernet port (802.3)
  • Internet (LAN): 3 x 10/100 BaseT Ethernet port (802.3)
  • Phone (FXS): 4 x RJ-11 FXS analog phone port
  • Phone (FXO): 1 x RJ-11 port for telco relay to Phone Port 1 only
  • USB: 3 x USB 2.0
  • Reset button: located on rear of case
  • LEDs: Power/Status, Ethernet Activity (WAN), Ethernet Activity (LAN), Phone 1-4
  • LED indications: Power On, Status, Upgrade in Progress Status, Packet RX/TX, Phone Port Status


Polycom OBi504 Datasheet

4 line VoIP adapter and voice gateway connects small business analog phones and fax machines to the digital voice communications world


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