Replace costly legacy ISDN circuits with elastic SIP channels that scale instantly with your call volume — backed by redundant infrastructure, automatic failover, and carrier-grade quality at a fraction of the cost.
Tech Network Limited's SIP trunking service connects your existing PBX, UCaaS platform, or softswitch directly to our carrier-grade voice network. Unlike traditional ISDN circuits, SIP trunks scale elastically — adding and releasing channels in real time to match your actual call volume, eliminating the cost of over-provisioning.
Our trunks are delivered over dual-carrier, redundant connections with automatic failover between network paths. If your primary connection experiences any degradation, traffic routes to a secondary path within seconds — maintaining service continuity without manual intervention.
Channels scale automatically with demand — handle peak call volumes without pre-provisioning capacity you don't use day-to-day.
Dual-path delivery with automatic failover between network routes. Your calls continue uninterrupted even during carrier disruptions.
Customers typically save 40–60% versus legacy ISDN/PSTN circuits, with no per-channel hardware costs and usage-based billing options.
Works with any SIP-compatible PBX, UCaaS platform, or softswitch — Cisco, Avaya, 3CX, Asterisk, FreePBX, and more.
Start with as few channels as you need and scale instantly to thousands — no hardware provisioning, no lead time, no minimum channel commitment.
All trunks are delivered over geographically diverse network paths with automatic failover — eliminating single points of failure.
Supports both IP-based authentication (for static IP deployments) and SIP registration (for dynamic IP or remote workers).
Full support for G.711 a-law and u-law, G.729 (bandwidth-efficient), G.722 (HD voice), and Opus — negotiated automatically during call setup.
Live channel utilisation dashboard showing active calls, peak usage, CDR access, and quality metrics — all in your online portal.
Choose from per-minute billing for variable traffic, flat-rate monthly bundles for predictable costs, or a hybrid of both.
| Protocol | SIP (RFC 3261), SIP over TLS/SRTP (optional) |
| Channel Capacity | 1 to 10,000+ concurrent channels |
| Authentication | IP whitelist or SIP registration |
| Codecs | G.711 (a/u), G.729, G.722, Opus |
| Redundancy | Dual carrier paths, automatic failover |
| DTMF | RFC 2833, SIP INFO, in-band |
| Uptime SLA | 99.9% |
| Billing | Per-minute, flat-rate monthly, or hybrid |
| Setup Time | Same-day for standard configurations |
Microsoft Teams Direct Routing certification available. Encryption (SIP TLS + SRTP) and SBC (Session Border Controller) integration support available on request.
Migrate from legacy ISDN trunks to SIP at a fraction of the cost — without replacing your existing PBX investment.
Connect multiple office locations through a centralised SIP trunk configuration, with shared channel pools and unified dial plans.
Platform operators use our SIP trunking to deliver outbound calling and DID termination services to their business subscriber base.
Most customers achieve 40–60% savings versus legacy circuits. Contact our team for a cost comparison and same-day provisioning.