Linksys 1 x Port RJ-11 FXS Phone + 1 x Port RJ-11 FXO Phone Voice Gateway with Router - SPA3102

The Linksys SPA3102 is a versatile Voice over IP (VoIP) gateway and router featuring 1x RJ-11 FXS port for connecting an analog phone and 1x RJ-11 FXO port for connecting a PSTN telephone line. Designed for small businesses and home offices requiring seamless integration between VoIP and traditional PSTN telephony, it enables simultaneous VoIP and analog phone line use — providing failover to the PSTN line when internet connectivity is unavailable.

Product Details

• Part Number: SPA3102
• Manufacturer: Linksys (Cisco)
• Model: SPA3102
• Product Type: VoIP Voice Gateway with Router

Key Features

• 1x FXS Port (RJ-11): Connects a standard analog telephone or fax machine to VoIP service
• 1x FXO Port (RJ-11): Connects to a PSTN telephone line for analog fallback and failover
• Integrated Router: Built-in router for internet sharing and VoIP traffic management
• PSTN Failover: Automatically routes calls to PSTN line when internet is unavailable
• SIP Compatible: Works with major SIP-based VoIP providers and IP PBX systems
• Web-Based Management: Easy configuration via built-in web interface

Technical Specifications

• Part Number: SPA3102
• FXS Ports: 1x RJ-11 (analog phone/fax)
• FXO Ports: 1x RJ-11 (PSTN line)
• WAN Port: 1x Ethernet (RJ-45)
• LAN Port: 1x Ethernet (RJ-45)
• Protocol: SIP
• Voice Codecs: G.711, G.726, G.729a
• Management: Web-based GUI, IVR

Use Cases

• SOHO VoIP Gateway: Connecting analog phones to SIP-based VoIP services in home and small office environments
• PSTN Failover: Automatic fallback to analog PSTN line during internet outages
• Fax over IP: Connecting analog fax machines to VoIP infrastructure
• IP PBX Integration: Analog line interface for Asterisk, FreePBX, and other IP PBX systems

Compatibility Notes

• Compatible with major SIP-based VoIP providers including Vonage, RingCentral, and hosted PBX platforms
• Works with Asterisk, FreePBX, and other open-source IP PBX systems
• FXO port connects to standard PSTN analog telephone lines
• FXS port supports standard analog telephones and fax machines

Frequently Asked Questions

What is the difference between FXS and FXO ports?

FXS (Foreign Exchange Station) ports connect to analog phones or fax machines — providing dial tone and ring voltage. FXO (Foreign Exchange Office) ports connect to PSTN telephone lines from the telephone company — allowing the gateway to interface with the analog phone network.

Does the SPA3102 support PSTN failover?

Yes — the SPA3102's FXO port connects to a PSTN line, enabling automatic failover to the analog telephone network when internet connectivity is lost — ensuring continuous phone service.

Is the SPA3102 compatible with Asterisk or FreePBX?

Yes — the SPA3102 is widely used with Asterisk, FreePBX, and other open-source IP PBX systems as an analog telephone adapter (ATA) and PSTN gateway for connecting analog phones and lines to VoIP infrastructure.

Whether you are connecting an analog phone to a SIP VoIP service, adding PSTN failover to a home office VoIP setup, or integrating analog lines into an Asterisk-based IP PBX, the Linksys SPA3102 delivers the FXS/FXO gateway functionality, SIP compatibility, and integrated routing your VoIP infrastructure demands.