Eltek R7121-L1

SIP Gateway with 2 FXS
  • 1x FE WAN Port (RJ-45)
  • 1x FE LAN Port (RJ-45)
  • 2x FXS Ports (RJ-11)

The Eltek R7121 is a Feature-Rich Analog Telephone Adapter, which enables you to connect standard telephone and make VoIP calls using your broadband connection. There’s no need to replace your existing analog telephones just because you want to enhance your phone system.

Easy to install with a guided installation CD ROM and simple to use, the Eltek R7121 connects standard telephones or fax machines to any Voice over IP (VoIP) service provider.

Well equipped with two FXS RJ-11 phone interfaces, you can speak in parallel with two telephones and even two different VoIP providers if needed. With the nice design you can easily place the adapter in your living room or hide the small device in your cupboard.

› Datasheet R7121-L1

Technical Specification

Telephone features

  • G.711: 64k bit/s (PCM)
  • G.723.1: 6.3k / 5.3k bit/s
  • G.726: 16k / 24k / 32k / 40k bit/s (ADPCM)
  • G.729A: 8k bit/s (CS-ACELP)
  • G.729B: adds VAD & CNG to G.729
  • Call Waiting
  • Call Transfer
  • Call Forward as Busy forward, Non-Answer forward, unconditional forward
  • DND support
  • 3-ways conference

DTMF Function

  • RFC2833
  • In-Band DTMF
  • SIP Info

Fax Modes

  • T.38 relay support
  • G.711 pass through

IP Specifications

  • SIP (RFC 3261)
  • SDP (RFC 2327)
  • STUN (RFC3489)
  • RTP Payload for DTMF Digits (RFC2833)
  • SIP Session Timers (RFC 4028)
  • DNS SRV (RFC 2782)
  • Outbound Proxy Support
  • SIP REFER method (RFC 3515)
  • Media/ Ringing Tone Generation (RFC 3960)
  • Message Waiting Indicator (RFC 3842)

Call features

  • Adjustable Volume
  • VAD / Dynamic Jitter Buffer
  • Caller ID Generation : DTMF/FSK/NTT CID
  • Peer-to-Peer Call by Dial Plan
  • Different Country Tone Table Configuration

Network and security

  • WAN: PPPoE client, DHCP client, Fix IP Address, PPTP
  • QoS : DSCP / VLAN Tag
  • PTP/L2TP VPN Client
  • NAT
  • Port / IP / MAC Filter

Configuration / Management

  • Web configuration interface; password protected
  • Firmware upgrades through HTTP
  • SNMP v1/v2 (Customization Project)
  • IVR
  • TR069/TR098/TR104/TR106/TR111 (Project Base)
  • Auto-Provision by HTTP/TFTP/FTP (Project Base)


  • 1x 100BaseT Ethernet Port (RJ-45) WAN
  • 1x 100BaseT Ethernet Port (RJ-45) LAN
  • 2x FXS Telephone Port (RJ-11) for VoIP
  • 1x Power on/off switch
  • 1x Reset switch

Operating temperature

  • Operating Temperature: 0°C~40°C
  • Storage Humidity: 10%~90% RH

AC Power

  • AC100V-240V, DC12V/1A, 50/60 Hz

Physical Specifications

  • Weight 165g
  • Width: 115mm, Height: 86mm, Depth: 29mm


  • Realtek


  • CE, FCC, RoHS