Any PBX that can accept ISDN/Q.931 can accept VanillaIP SIP Trunks, either through native SIP support on newer platforms or through an external gateway on older systems.
Native SIP Interface Support – The systems listed in our compatability matrix all support SIP interfaces direct on the chassis. Typically this means that the DSL can be delivered directly onto the pbx.
External Gateways – External gateways from VegaStream and OneAccess allow protocol conversion from SIP to Q.931. In this way the existing ISDN/Q.931 trunk card on the PBX connects to the gateway, so the customer does not have additional PBX hardware costs
The gateway dial plan will also allow extension dialling from PBX extensions to other VanillaIP hosted VoIP extensions
