Fault-Tolerant Office VoIP Telephone Network - SIP through SpeedFusion with Failover to Landline


#1

Environment:

  • This shop has two branches, with a centralized 3CX VoIP PBX at head office and remote VoIP handsets at Site 1.
  • All calls come in over SIP from an external SIP provider and are handled and routed by the 3CX PBX server at the HQ site to handsets at both locations.

Requirement:

  • VoIP call resilience between locations. VoIP calls should not drop when a WAN link fails.
  • QOS to prioritise VoIP across the VPN between the remote site and the HQ site.
  • Load balanced bandwidth at all locations. Adding additional bandwidth (DSL/EFM/FTTC) to any location should be cheap and easy.

Recommended Solution:

  • Balance 380 at both locations allowing for up to 3 WAN links of any type all of which can provide load balanced internet access and be bonded into a SpeedFusion VPN tunnel.
  • SpeedFusion VPN between the two locations to provide an Unbreakable VPN to maintain live VoIP calls even if a WAN link should fail mid call.

Additional Benefits of this solution

  • Cellular dongles can be used on the Balance 380s to provide a 4G/LTE backup in the event all fixed line connectivity fails.
  • Multiple ISPs can be used for provider diversity.