GW8200 AOS PRI Gateway

The GW8200 AOS PRI Gateway

  • PRI to IP Gateway
  • Supports SIP/RTP, RFC4040, clear mode, ISDN PRI access
  • 1, 2 or 4 PRI ports in a 1U high platform
  • Channelised E1, T1 or J1 connectivity for ISDN PRI
  • Transparently handles all traffic types including voice, data and video
  • Clock source of receiver
  • ISDN signalling over SIP
  • Automated secure key deployment

ISDN network equipment is becoming obsolete and telecommunications operators are terminating ISDN services to their customers. However, this can be costly and disruptive for customers that rely on these networks. Virtual Access products solve this problem by converting ISDN interfaces to work over IP/Ethernet, meaning that the customer does not need to upgrade their equipment.
The Virtual Access PRI Gateway is built on current technologies and therefore can provide a commitment to long term support. Based on VoIP standards and ISDN PRI, the PRI Gateway adds E1/T1 interfacing to a flexible stack. Relaying ISDN services over most network architectures including VLANs, GRE, L2TP and IPSec.
Extending ISDN Services over IP
For customers who cannot decommission their ISDN hardware due to a dependency on ISDN clocking, the PRI Gateway in conjunction with the Virtual Access ISDN BRI router is the answer. Existing ISDN traffic can be relayed over IP, the stable clocking that ISDN provides can be recovered at up to 120 customer sites and presented on BRI interfaces.
PBX Migration
Where ISDN services are being discontinued by telco providers, the PRI Gateway can be deployed at customer premises during migration of existing PRI-based PBX systems.
Existing ISDN phones and E1/T1 multiplexing hardware can be kept in service at customer sites. The E1/T1 can be integrated with VoIP services. Internet and phone services are consolidated on one broadband access service, and expensive or unsupported PRI connections to the PSTN can be decommissioned.

ISDN Replacement
The Virtual Access PRI Gateway supports ISDN PRI interfaces, enabling a direct replacement for a PRI network. The PRI Gateway also supports SIP/RTP interfaces meaning internet service providers can support the migration of the customer base from ISDN to SIP/RTP.
Assured Access
The Virtual Access PRI Gateway supports redundant Ethernet ports to increase the level of resilience. The device provides two gigabit Ethernet ports ensuring the device can connect to the latest networks and providing compatibility with older Ethernet technologies such as 100BASE-T.

ISDN has strict network requirements and comprehensive diagnostics are required. The Virtual Access PRI Gateway measures data streams for latency, jitter and packet loss with configurable levels of tracing and fault recording.
Centralised Management & Service Monitoring
The PRI Gateway benefits from Activator, the Virtual Access centralised configuration management and monitoring system. Activator simplifies router deployment and ongoing management with its advanced automated services.

Software Features


  • Local and remote advanced configuration through embedded web server
  • Command Line Interface via SSH
  • SNMP agent
  • SSH server
  • Remote software upgrade via Activator or command line

Fault Investigation and Reporting

  • Event logging
  • Packet tracing
  • Syslog support

Service Features

  • Host traffic monitoring
  • DHCP server/client/DHCP relay
  • DNS proxy
  • Port forwarding
  • Packet filtering and firewalling
  • Performance Monitor


  • SIP authentication
  • Internal list option


  • Secret pre-shared keys – automatically distributed using Activator

Routing Features

  • Dial planner: sophisticated call routing capabilities, standalone or gatekeeper/proxy integration
  • SIP registration to multiple proxies
  • Traversal
  • IPv4 and IPv6
  • DynDNS
  • NTP Client
  • VLAN support
  • Packet filtering
  • Firewall
  • Port forwarding
  • Static routes
  • BGPv4/OSPF/RIP (v1 and v2)


  • Includes:
    • RFC3261 SIP
    • RFC3550 RTP
    • RFC4040 RTP
  • Virtual Router Redundancy Protocol (VRRP)
  • IPSec
  • L2TP
  • GRE
  • AES (256bit)

Call Quality

  • 802.1p/Q.VLAN tagging
  • Echo cancellation (G.168 up to 128ms)

Hardware Features

Hardware Features

  • PRI Interfaces
    • E1 Interface
    • Euro-ISDN
    • ISO QSIG
    • VN4
    • CAS R2MFC
    • CAS private wire
  • T1 Interface
    • NI1/NI2
    • AT&T 5ESS
    • DMS100
    • CAS private wire
    • CAS (RBS)
  • ISDN Interface
    • J1
    • Primary rate ISDN (user configurable NT/TE)

Line Interface Applications

  • RJ45 connector 100ohm.120ohm balanced ITU G.703 and G.6704 compliant

VoIP Interface

  • Up to 120 VoIP channels
  • SIP: up to 500 clients supported
  • Audio codecs: 
    • G.711 (a-law/µ-law) (64kbps)
  • Fax and modem supported by Voice Band Data mode
  • RFC4040 for transparent relay of data calls

Ethernet Interfaces

  •  2 x 10/100/1000Base-T gigabit Ethernet ports

Serial Interfaces

  • RS232 or RS485 option

USB Interfaces

  • 4 USB slots

Operational Modes

  • Switch modes: PRI, CPE/NET
  • Switch types: NT1, N12, EuroISDN, Q.SIG

Approvals and CE Certificates

  • EN60950 safety approval
  • EN55022 and EN55024 EMC

Power Options

  • 100V-240V AC, 25 Watts
  • IEC mains connector
  • 9-36 or 18-75VDC isolated

Operating Temperature

  • Operating air temperature 0°C to +50°C

Storage Temperature

  • -20°C to +85°C

Physical and Environment

  • Unit size: H44 x W370 x D230(mm)
  • Chassis format: 1U
  • Optional conformal PCB coating for harsh environments
  • Rack mountable
GW8200 Series Model Table