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Vigor 2820VSn ADSL & ISDN Router Firewall
  • ADSL/ADSL2+, ISDN, 3G and Broadband Router
  • Two ISDN2e (BRI) Interfaces
  • First ISDN Interface supports either:
    • Dial-up Internet connection (with no ADSL)
    • ISDN Backup in case of ADSL/ISP failure
    • S0-Bus Mode for internal ISDN phones for VoIP
  • Secondary ISDN Interface supports:
    • S0-Bus for internal ISDN phones for VoIP
  • Comprehensive and Robust Firewall
  • VoIP port with PSTN passthrough
  • 802.11n Wireless LAN ('n' models only)
This product has been discontinued.

Vigor 2820VSn ADSL & ISDN Router Firewall

The Vigor 2820VSn is part of the Vigor2820 ADSL router series, with the addition of two ISDN ports. The ISDN interface connects to any compatible ISDN2e service andcan provide either primary internet connection or Dial-up backup for your primary ADSL connection. The Vigor 2820VSn also features an analogue telephone port for VoIP services. All other features of the standard Vigor 2820 model are supported. For WAN-Failover, you can select either ISDN, 3G modem or Ethernet WAN port.

Vigor 2820 Connectivity Schematic
Note : Only one method of Internet backup can be selected at once.

ISDN Features

The Vigor 2820VS features two ISDN interfaces which provide connectivity to ISDN BRI lines (ISDN2e, BT Highway) for Internet access (either primary or backup) and also an internal S0-Bus for connection of ISDN digital telephone sets. Even without an external ISDN line, this gives you additional VoIP telephone capacity as both ISDN ports can be configured as internal buses with two phones connected to each port (each ISDN S0 bus is full 2B+D).

  • Two ISDN Ports : One fixed S0 Internal bus & One Switchable External Trunk/Internal S0
  • Compatible with ISDN2e lines (PtMP/BRI only)
  • Ideal for ISDN Backup to main Internet connectivity
  • Dial-on-Demand for primary ISDN Internet connection or ADSL backup
  • Internal powered S0 Bus allowing connection of ISDN telephone sets
  • RJ-45 S/T Interfaces
  • ISDN Loop-Through
  • ISDN On-net / Off-net
  • Euro ISDN Compatible
  • Support 64 / 128Kbps ( Multilink-PPP)
  • BoD ( Bandwidth on Demand )
  • Remote Dial-In / LAN-to-LAN Connection
  • Remote Activation (Dial back on ISDN Caller ID recognition)
  • ISDN Port Passthrough During Power Cut

Vigor 2820VS Connectivity Schematic

The above diagram should be used as a working schematic only, rather than an exact representation of the unit's connectivity and should be viewed with these notes: Of the two ISDN ports, ISDN Port 1 can be configured either as a TE Port, that is, for connecting into an ISDN2e/Highway line or configured as an S0 Bus for local connection to ISDN telephones or other compatible ISDN equipment. ISDN Port 2 is permanently configured as an Internal S0 Bus. The USB port can be used for a compatible 3G modem or a shared compatible printer connection. The secondary WAN Port ('WAN2') can be used for connection to any Ethernet feed for load balancing or Internet backup. The LAN Ports are not shown on this diagram. Only one method of Interner failover can be selected at any one time.

Voice-over-IP Features

The Vigor 2820VS has an analogue phone port and an analogue line port to provide full PSTN and VoIP integration on the same phones, via both the Internet and your regular analogue line. If you have an ISDN phone, you can also use that on the unit's 'Internal S0-Bus' to make additional VoIP phone calls.

The analogue 'Line' port connects into your regular analogue line (PSTN/POTS*). This then gives the telephones access to your analogue line to allow you to make calls as well as your VoIP facility (you can select the PSTN line instead of VoIP by dialling #0). Incoming calls are automatically switched through to your telephone(s) (either one or both) so that each phone can be used for both VoIP and POTS calls. Both telephones plugged into your router have access to VoIP and your analogue line. In addition, using the 'Digit-Map' facility you can set rules about particular call destinations using either the POTS line or your SIP/VoIP service. For example, local calls can be routed via your PSTN line (if you have a free calls package for example) whereas international calls can go via your preferred VoIP provider; there is flexibility to have several digit-map rules.

Vigor 2820VS Connectivity Schematic

The above diagram should be used as a working schematic only, rather than an exact representation of the unit's connectivity and should be viewed with these notes: ISDN is not currently available on this model. The USB port can be used for a compatible 3G modem or a shared compatible printer connection. The secondary WAN Port ('WAN2') can be used for connection to any Ethernet feed for load balancing or Internet backup. You cannot use both WAN2(Ethernet) and USB for 3G at the same time. The LAN Ports are not shown on this diagram.

*POTS = Plain Old Telephone Service - The traditional analogue phone voice line in your home/office, e.g. B.T. That line may also be carrying your ADSL data signal.

  • Vigor 2820VSn VoIP Features :
    • One 'FXS' Phone Ports
    • One 'FXO' Line Port for connection to analogue (POTS) line
    • Automatic phone switch-over for incoming calls on either PSTN or VoIP
    • Hotline (Dial preset number when handset lifted)
    • Digit-Map facility for LCR selection
    • Protocols: SIP, RTP / RTCP
    • 12 SIP Registrar Accounts (for up to 12 VoIP providers)
    • G.168 Line Echo-cancellation
    • Automatic Gain Control
    • Jitter Buffer ( 125ms )
    • Voice Codecs:
      • G.711 A / µ Law
      • G.723.1
      • G.726
      • G.729 A / B
    • VAD / CNG
    • Tone Generation: DTMF , Dial , Busy , Ring Back , Call Progress
    • DTMF Transmission: In Band / Out Band ( RFC-2833 ) / SIP info
    • FAX / Modem Support G.711 Pass-through
    • T.38 for FAX
    • Supplemental Services (Dependent on ITSP):
      • Caller ID
      • Call Hold / Retrieve
      • Call Waiting
      • Call Waiting with Caller ID
      • Call Transfer
      • Call Forwarding ( Always , On Busy and On No Answer )
      • DND (Do not Disturb)
      • Call Barring ( Incoming / Outgoing )
      • MWI ( Message Waiting Indicator ) ( RFC-3842 )

Vigor2820VS Front Panel