ITSP & Carrier
Voice infrastructure built for the business of voice.
We build the platforms ITSPs use to resell minutes, manage numbers, and operate carrier-grade services — without building a 20-person engineering team.
Challenges you're facing
Multi-carrier peering complexity
Every carrier interprets RFC 3261 slightly differently. Managing SIP normalization, failover, and LCR across 10+ carriers without a proper routing platform is a full-time job for someone technical.
Scale beyond a single POP
A Kamailio box in one data center works until it doesn't. Geographic redundancy, inter-POP failover, and distributed registration require real engineering.
Billing and CDR accuracy
Lost CDRs mean unbilled calls. Duplicate CDRs mean billing disputes. Getting at-least-once CDR delivery with deduplication right is harder than it looks.
SIP security and DoS
SIP scanners are relentless. An exposed SIP port without proper rate limiting and authentication will be exploited within hours of launch.
How we solve it
Kamailio routing platform
Multi-POP Kamailio deployment with dispatcher-based failover, LCR from your billing system, and SIP normalization for every carrier you peer with.
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Session Border Controller
SBC layer for topology hiding, DoS protection, and SRTP/RTP translation at the carrier edge.
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SIP Trunking infrastructure
Our SIP trunking product as a wholesale layer for your reseller business — carrier-grade uptime, your brand.
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In production
Reduced PDD by 340ms
Tier-1 European ITSP
Kamailio dispatcher tuning and SBC route optimization cut average PDD from 820ms to 480ms — a 41% reduction. Achieved without adding POP infrastructure by rebalancing dispatcher weights against measured per-carrier latency.
Ready to build on carrier-grade voice?
Talk to a VoIP engineer — not a salesperson.