I need an IPRN switch brought online fast, fully wired for billing integration and ready to carry live traffic. The core signalling will run over SIP, so every module you build or configure must interoperate cleanly with SIP endpoints and the upstream carrier trunks I already have in place. Billing is the priority: once a call lands on the switch the CDRs must flow straight into our existing rating platform without manual touches. I am open to whether you plug in a ready-made mediation layer or write custom logic—what matters is that usage records appear in real time and reconcile correctly at the end of each day. You will get SSH access to a fresh cloud instance plus the credential set for my billing server. I expect you to: • Deploy or compile the soft-switch software, enable SIP, and confirm two-way audio on test numbers. • Configure the billing hooks so every call generates an accurate CDR, tagged with the destination IPRN and cost code. • Hand over a short document outlining the configs and commands needed for ongoing maintenance. Completion is urgent; once it is stable and billing is verified we go live immediately.