Carrier-grade VoIP engineering
Protocol-level SIP expertise, production-ready UC platforms, and 24/7 operations — trusted by enterprises, ITSPs, and contact centers worldwide.
Deep expertise across the open-source voice stack
Services
Thirteen specialized practice areas covering the full open-source voice stack and everything above it.
Custom dialplans, AGI/ARI integrations, and production-hardened Asterisk builds.
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High-concurrency media handling, XML dialplans, and mod_sofia tuning for FreeSWITCH deployments.
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Dispatcher tuning, SIP routing logic, and Kamailio-as-SBC deployments for carrier platforms.
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OpenSIPS routing, load balancing, and SBC deployments with full control-plane integration.
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Real-time WebRTC apps on LiveKit — SFU deployment, custom agents, and SIP bridging.
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Products
Operational platforms and number inventory — SLA-backed and globally reachable.
Wholesale and retail voice termination engineered for uptime.
Starting at $0.004/min termination. Custom pricing for wholesale volume.
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A cloud phone system your IT team can actually extend.
Starting at $12/extension/month. Volume discounts above 50 extensions.
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Predictive and progressive outbound that keeps agents talking.
Custom pricing — scoped per deployment based on seat count and minutes.
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RTP relay, transcoding, and NAT traversal at carrier scale.
Custom pricing — scoped per deployment based on concurrent session count and codec mix.
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Local and toll-free numbers across 40+ countries.
Starting at $1.00/number/month for US local. International rates vary by country.
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Answering Machine Detection powered by real-time speech models.
Starting at $0.002/call analyzed. Custom pricing for high-volume deployments.
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Why Tumarm
We own the full stack — from packet capture to customer-facing portal.
We don't just configure SIP — we debug it at the packet layer, patch upstream, and optimize dialplans the way a systems engineer would.
Every deployment is designed for 99.99%+ uptime with redundant SBCs, HA media proxies, and observable SIP signaling end-to-end.
From kernel tuning and RTP prioritization to customer-facing UC portals — one team, one accountability, no handoff gaps.
Follow-the-sun incident response with on-call VoIP engineers, not tier-1 ticket-shufflers reading from a script.
Architecture
From signaling to media to analytics — we architect and operate every layer of the voice path.
Edge: SBC + Kamailio
SIP normalization, topology hiding, and DoS protection before anything reaches your core.
Core: FreeSWITCH / Asterisk
Business logic, feature execution, and media handling on proven open-source platforms.
Media: rtpengine cluster
RTP relay, SRTP transcoding, and NAT traversal — close to users, not in a single DC.
Observability: Prometheus + Grafana
Real metrics from every layer — SIP, media, CDR — not just server-level health checks.
Reference Architecture
For Your Business
Modernize your voice infrastructure. Migrate legacy PBX, deploy unified communications, and integrate voice into your business applications.
80% reduction in call-handling costs typical
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Launch and scale your voice business. SIP trunking platforms, billing integration, SBC deployments, and number inventory management.
Handle 10M+ CDRs/day on our reference architecture
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Predictive dialers that actually dial. Vicidial customization, AI AMD, WebRTC agent apps, and compliance-ready recording.
30-45% agent productivity gains with AI AMD
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Case Studies
Reduced PDD by 340ms
Tier-1 European ITSP
Post-dial delay averaged 820ms across 12 POPs, causing measurable caller abandonment and carrier complaints.
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.
False-positive rate down to 4.2%
US Healthcare Contact Center
AMD false-positive rate of 18% was flagging live patients as machines, costing 2,000+ agent-productive hours per month.
Deployed AI AMD with custom model retrained on healthcare-specific call audio. False-positive rate dropped from 18% to 4.2%, recovering the equivalent of 1,600 agent-hours per month and improving patient experience scores by 23 points.
99.7% call setup success
Global SaaS Platform
WebRTC call setup failed for 6% of users behind enterprise NAT, generating support tickets and driving churn among enterprise accounts.
Deployed clustered media proxies with ICE-lite fallback and additional TURN coverage in three enterprise-heavy regions. Call setup success rate rose from 94% to 99.7%. Enterprise account churn attributed to voice quality dropped to zero in the following quarter.
How We Work
We map your current state — topology, traffic patterns, failure modes, and the gap between what exists and what you need.
We propose a solution: right-sized infrastructure, clear failover logic, and a migration path that doesn't require a maintenance window.
We ship code, configuration, and infrastructure — version-controlled, tested at 2× peak load before any production cutover.
We run what we build: monitoring, on-call, incident response, and continuous improvement as traffic and requirements evolve.
Our clients
Contact centers, ITSPs, and enterprises building on carrier-grade infrastructure.
Testimonials
Real results from contact centers, ITSPs, and enterprises.
"We'd been fighting post-dial delay across our European POPs for eight months. The Tumarm team found the root cause in two days — a dispatcher weighting issue we'd missed — and had it fixed in production by the end of the week. The pcap they walked us through was the clearest explanation of a SIP problem I've ever seen."
"Our AMD false-positive rate was killing productivity. We'd tried tuning Vicidial's built-in AMD for a year with no real improvement. Tumarm's AI AMD cut our false positives by 75% in the first month. The custom model training for our healthcare campaign audio was the difference."
"We run 300+ seat outbound campaigns around the clock. Before Tumarm, our dialer would silently degrade past 200 concurrent channels — agents sitting idle while the system choked. They re-architected our Vicidial cluster in two weeks. We haven't hit a ceiling since, and contact rates are up 28%."
Talk to a VoIP engineer — not a salesperson.