Customer migrating from ISDN to SIP trunks can use Pure IP for dedicated point-to-point Ethernet circuits to ensure the best possible quality of service is retained.
Pure IP would provide a dedicated data circuit directly from the customer's site to connect back into the Pure IP core network. This is normally a fully transparent layer 2 point-to-point connection only used for voice traffic.
Pure IP allows customers to use their existing corporate MPLS provider to connect to the Pure IP network via our primary interconnect points in London, New York, Singapore, Sydney, or Auckland. Pure IP, in this scenario, will provide an access port on our core infrastructure or where necessary collocate routers in the datacenters to complete the cross-connect.
Customers have the option of using SIP over UDP, TCP or TLS in any of these scenarios. In all scenarios, for every 10 parallel calls, 1Mbps of dedicated bandwidth is required. For example, customers looking to replace a T1 would need to allocate 24 channels and 2.4Mpbs of data to support the voice service without using compression.