Voice · Carrier-grade SIP

Every call routed at carrier speed.

SIP trunking across 195+ countries with HD voice, least-cost routing, and a 99.99% uptime SLA. Per-minute metering, zero commitment — from your first trunk to tier-1 scale.

Provision a trunk Read the docs

195+

Countries

99.99%

Uptime SLA

<50ms

Median PDD

carrier-console — nusip.coLive

→ INVITE sip:[email protected] SIP/2.0

Route: lcr-engine → carrier-mesh[za-jnb-01]

Codec: OPUS/48000, G.711a fallback

← SIP/2.0 200 OK · answered in 312ms

+44 20 7946 ····uk-lon-0238ms

+1 415 555 ····us-sjc-0144ms

+91 22 6150 ····in-bom-0172ms

+61 2 8015 ····au-syd-0141ms

NU SIP

3k–8kCPS · stateless proxy

800–2kCPS · stateful

300k+Registrations / node

64k+Sessions / process

The flow

Five hops from INVITE to answer.

01 · INGRESS
Ingress
Inbound INVITE accepted at the nearest edge PoP with TLS + SRTP.
02 · AUTH
Auth & ACL
IP/credential auth, fraud scoring, and rate limits per trunk.
03 · LCR
LCR engine
Least-cost route picked across carriers with live QoS weighting.
04 · MESH
Carrier mesh
Handed to a tier-1 peer with automatic failover on 4xx/5xx.
05 · EGRESS
Egress + CDR
Connected, media bridged, CDR streamed to your stack in real time.

Live · 12,408 active calls

Live observability

Watch every route in real time.

See active calls, per-carrier latency, and least-cost decisions as they happen. Drill into any CDR, set alert thresholds, and block suspect traffic in one click — the same console your NOC lives in.

Per-route latency & QoS scoring
Real-time CDR stream + signed webhooks
Automatic failover on 4xx / 5xx

38msMedian PDD

99.2%ASR

4m12sACD

Capabilities

Full-stack, production-ready.

Routing & HA

Stateless & transaction-stateful proxy
Serial & parallel forking
LCR across millions of rules
Active/active replication

Transport & media

UDP · TCP · TLS · SCTP
IPv4 / IPv6 transport gatewaying
WebRTC over secure WebSocket
Transparent SRTP & NAT traversal

Security & anti-fraud

Digest, IP & network auth
ACL / group authorization
Topology hiding
Real-time fraud scoring & blocking

Numbering & DNS

SRV / NAPTR resolution
ENUM number lookup
SRV DNS failover & caching
Multi-domain & multi-homed

Accounting & billing

Event-based, multi-leg CDRs
Built-in prepaid engine
RADIUS / DIAMETER export
SQL & NoSQL backends

Control & observability

SNMP + RPC statistics
Per-route latency & QoS metrics
Runtime config — no restarts
REST · GraphQL · JSON-RPC

3k–8kCPS · stateless proxy

800–2kCPS · stateful

300k+Registrations / node

64k+Sessions / process

NU SIP runs on a hardened, RFC 3261 SIP core — fully re-engineered with our own middleware, least-cost-routing logic, billing, and operator console. You inherit carrier-proven internals and linear cluster scaling toward 1M+ concurrent calls, without ever touching a config file.

Features

Everything you need to scale.

Built for the demands of modern telecoms and digital infrastructure — reliable, programmable, and production-ready.

Global SIP trunking

Registrar, proxy, and redirect roles on a full RFC 3261 stack. Inbound + outbound across 195+ countries with NAT traversal.

Media handling

Transparent SRTP, real-time transcoding, and recording — plus WebRTC bridging over secure WebSocket.

Least-cost routing

Route selection scaling to millions of rules, with live QoS weighting and automatic failover across carriers.

REST & GraphQL APIs

Trunks, DIDs, and CDRs via REST, GraphQL, and JSON-RPC. Signed webhooks for real-time call and DLR events.

Provision in code

A trunk is one POST away.

Spin up trunks, attach DIDs, and stream CDRs from your own stack. Idempotent, versioned, and documented end to end.

REST + GraphQL, OpenAPI spec
Signed webhooks for call & DLR events
Per-trunk rate limits & fraud scoring

provision-trunk.sh

# create a SIP trunk + attach a DID pool
curl -X POST https://api.nusip.co/v1/trunks \
  -H "Authorization: Bearer $NU_SIP_KEY" \
  -d '{ "name": "prod-jnb", "codec": "opus",
       "lcr": true, "did_pool": "za-mobile" }'

# → 201 Created
{ "id": "trk_8Fq2…", "status": "active",
  "sip_uri": "prod-jnb.nusip.co" }

Route your first call today.

Provision a trunk in minutes. Per-minute billing, no commitment, 30-day pilot.

Provision a trunk Talk to a voice engineer

No credit card required · 30-day pilot · Cancel anytime

All products

NU SIP·nusip.co

Live · 12,408 active calls

Live observability

Watch every route in real time.

Per-route latency & QoS scoring
Real-time CDR stream + signed webhooks
Automatic failover on 4xx / 5xx

38msMedian PDD

99.2%ASR

4m12sACD

Capabilities

Full-stack, production-ready.

Routing & HA

Stateless & transaction-stateful proxy
Serial & parallel forking
LCR across millions of rules
Active/active replication

Transport & media

UDP · TCP · TLS · SCTP
IPv4 / IPv6 transport gatewaying
WebRTC over secure WebSocket
Transparent SRTP & NAT traversal

Security & anti-fraud

Digest, IP & network auth
ACL / group authorization
Topology hiding
Real-time fraud scoring & blocking

Numbering & DNS

SRV / NAPTR resolution
ENUM number lookup
SRV DNS failover & caching
Multi-domain & multi-homed

Accounting & billing

Event-based, multi-leg CDRs
Built-in prepaid engine
RADIUS / DIAMETER export
SQL & NoSQL backends

Control & observability

SNMP + RPC statistics
Per-route latency & QoS metrics
Runtime config — no restarts
REST · GraphQL · JSON-RPC

3k–8kCPS · stateless proxy

800–2kCPS · stateful

300k+Registrations / node

64k+Sessions / process

Features

Everything you need to scale.

Built for the demands of modern telecoms and digital infrastructure — reliable, programmable, and production-ready.

Global SIP trunking

Registrar, proxy, and redirect roles on a full RFC 3261 stack. Inbound + outbound across 195+ countries with NAT traversal.

Media handling

Transparent SRTP, real-time transcoding, and recording — plus WebRTC bridging over secure WebSocket.

Least-cost routing

Route selection scaling to millions of rules, with live QoS weighting and automatic failover across carriers.

REST & GraphQL APIs

Trunks, DIDs, and CDRs via REST, GraphQL, and JSON-RPC. Signed webhooks for real-time call and DLR events.

Provision in code

A trunk is one POST away.

Spin up trunks, attach DIDs, and stream CDRs from your own stack. Idempotent, versioned, and documented end to end.

REST + GraphQL, OpenAPI spec
Signed webhooks for call & DLR events
Per-trunk rate limits & fraud scoring

provision-trunk.sh

# create a SIP trunk + attach a DID pool
curl -X POST https://api.nusip.co/v1/trunks \
  -H "Authorization: Bearer $NU_SIP_KEY" \
  -d '{ "name": "prod-jnb", "codec": "opus",
       "lcr": true, "did_pool": "za-mobile" }'

# → 201 Created
{ "id": "trk_8Fq2…", "status": "active",
  "sip_uri": "prod-jnb.nusip.co" }

Route your first call today.

Provision a trunk in minutes. Per-minute billing, no commitment, 30-day pilot.

Provision a trunk Talk to a voice engineer

No credit card required · 30-day pilot · Cancel anytime

Every call routed at carrier speed.

Five hops from INVITE to answer.

Ingress

Auth & ACL

LCR engine

Carrier mesh

Egress + CDR

Watch every route in real time.

Full-stack, production-ready.

Routing & HA

Transport & media

Security & anti-fraud

Numbering & DNS

Accounting & billing

Control & observability

Everything you need to scale.

Global SIP trunking

Media handling

Least-cost routing

REST & GraphQL APIs

A trunk is one POST away.

Route your first call today.

Watch every route in real time.

Full-stack, production-ready.

Routing & HA

Transport & media

Security & anti-fraud

Numbering & DNS

Accounting & billing

Control & observability

Everything you need to scale.

Global SIP trunking

Media handling

Least-cost routing

REST & GraphQL APIs

A trunk is one POST away.

Route your first call today.