What is the difference between the SPA2100 and the SPA2102?

What is the difference between the SPA2100 and the SPA2102?

In short, the SPA2102 is the upgraded version of the SPA2100. Therefore its box looks slightly different to the older model.

The main difference is the upgraded port. The SPA2100 has a 10mbps port, while the SPA2102 has the 100mbps port. In most applications, the 10mbps port is more than efficent for standard VoIP functions. 

As a side note, the firmware for the SPA2102 will not work on the SPA2100. So make sure you always update your configuration according to the proper model.

Below is a datasheet comparison between the Linksys SPA2100 and the SPA2102.

Physical Interfaces Comparison


  • Two RJ-45 10base-T Ethernet ports
  • Two RJ-11 FXS Ports for analog circuit telephone device (Tip/Ring)


  • Two RJ-45 100base-T Ethernet ports
  • Two RJ-11 FXS Ports for analog circuit telephone device (Tip/Ring)

Voice Gateway


  • SIPv2 – Session Initiation Protocol Version 2 (RFC 3261, 3262, 3263, 3264)
  • SIP Proxy Redundancy – Dynamic via DNS SRV, A Records
  • Re-registration with Primary SIP Proxy Server
  • SIP Support in Network Address Translation Networks – NAT (incl. STUN)
  • Secure (Encrypted) Calling via Pre-Standard Implementation of Secure RTP


  • Session Initiation Protocol (SIP) v2 (RFC 3261, 3262, 3263, 3264)
  • SIP proxy redundancy-dynamic via DNS SRV, A records
  • Reregistration with primary SIP proxy server
  • SIP support in Network Address Translation (NAT) networks (including Serial Tunnel
  • Secure (encrypted) calling via prestandard implementation of Secure RTP

Voice Specifications


  • Dynamic Payload
  • Adjustable Audio Frames Per Packet
  • Fax Tone Detection Pass-Through
  • Real Time Fax via T.38 (Pending)
  • Voice Band Data Modem Support (Pending)
  • DTMF: In-band & Out-of band (RFC 2833) (SIP INFO)
  • Call Progress Tone Generation
  • Jitter Buffer – Adaptive
  • Frame Loss Concealment
  • Full Duplex Audio
  • Echo Cancellation – (G.165/G.168)
  • VAD – Voice Activity Detection w/ Silence Suppression
  • Attenuation / Gain Adjuustments
  • Flash Hook Timer
  • MWI – Message Waiting
  • Indicator Tones
  • VMWI – Via FSK
  • Polarity Control
  • Hook Flash Event Signaling
  • Caller ID Generation (Name & Number) – Bellcore, DTMF, ETSI
  • Music on Hold Client
  • Streaming Audio Server – Up to 10 Sessions


  • Dynamic payload
  • Adjustable audio frames per packet
  • Dual-tone multifrequency (DTMF): in-band and out-of-band (RFC 2833) (SIP info)
  • Flexible dial plan support with interdigit timers and IP dialing
  • Call progress tone generation
  • Jitter buffer-adaptive
  • Frame loss concealment
  • Full duplex audio
  • Echo cancellation (G.165/G.168)
  • Voice activity detection (VAD) with silence suppression
  • Attenuation/gain adjustments
  • Flash hook timer
  • Message waiting indicator (MWI) tones
  • Visual message waiting indicator (VMWI) via frequency shift keying (FSK)
  • Polarity control
  • Hook flash event signaling
  • Caller ID generation (name and number)-Bellcore, DTMF, European
    Telecommunications Standards Institute (ETSI)
  • Music on hold client
  • Streaming audio server-up to 10 sessions
  • Fax tone detection pass-through
  • Fax: G.711 pass-through or real-time fax over IP via T.38 (T.38 support is dependent on
    fax machine and network/transport resilience.)

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