“SMK's WebSocket tunneling dropped our PDD to under 0.5s and bypassed local firewall restrictions flawlessly. A game-changer for our mobile dialer.”
connecting.voice.worldwide
Global Voice Termination, Perfected.
Carrier-grade SIP trunking and direct routing to every country on earth with ultra-low PDD and 99.99% uptime.
Active Call
+1 (800) 442-0917
New York → Frankfurt · 00:04:12
Smart Routing
Optimized
Avg PDD
0.42s
ASR
71.4%
Voice termination
A-to-Z worldwide connectivity
Direct interconnections with Tier-1 carriers globally, delivering crystal-clear voice quality to every destination.
Tier-1 global reach
Direct interconnections with Tier-1 carriers worldwide, connecting your business to every country on earth.
Ultra-low PDD
0.42s
High ASR and ALOC, monitored on every route in real time.
Secure & reliable
99.99%
Redundant global POPs and fraud protection on every trunk.
Infinite scalability
Elastic SIP infrastructure that grows with your call volume instantly, no capacity planning required.
A-to-Z Worldwide Connectivity.
Direct interconnections with Tier-1 carriers globally, delivering crystal-clear voice quality to every destination.
Tier-1 Global Reach
Direct routes into every country, backed by redundant carrier interconnects on six continents.
ULTRA-LOW PDD
0.42s
99.99%
UPTIME · LAST 28 DAYS
Native SIP Dialers &
Secure Tunneling.
Custom mobile infrastructure built for flawless voice quality. Featuring advanced WebSocket tunneling to instantly bypass strict VoIP blockages.
Cross-Platform Ready
Optimized for native iOS and Android ecosystems.
Anti-Block Tunneling
Military-grade WebSocket & TLS 1.3 encryption.
Low Power Consumption
Modern push-notification architecture saves battery.
9:41
Calling+1 (800) 442-091700:02:47
1
2
3
4
5
6
7
8
9
*
0
#
TLS 1.3 Encrypted
Built for Developers
Integrate in minutes. Scale infinitely.
Powerful REST APIs, real-time Webhooks, and SIP routing controls. Automate your voice infrastructure seamlessly with your existing Node.js, Python, or automation workflows.
REST API & Webhooks
Real-time call events & billing.
Dynamic SIP Routing
Programmatic call control.
Seamless Automations
Easy webhook triggers for backend pipelines.
provision_trunk.js
1import axios from 'axios';
2
3// Provision a new outbound SIP trunk
4const trunk = await axios.post(
5 'https://api.smkvoip.com/v1/trunks',
6 {
7 region: 'global',
8 codec: 'OPUS',
9 max_channels: 500,
10 failover: true,
11 },
12 { headers: { Authorization: `Bearer ${API_KEY}` } }
13);
14
15console.log(trunk.data.sip_uri);
15
200 OK · trunk_id: sip_9f3a2c · 84ms
Up and running before your coffee gets cold.
No hardware to ship, no on-site install. Most teams take their first call the same day they sign up.
01
Claim or port a number
Grab a new local or toll-free number, or port your existing one over in minutes — no downtime.
02
Add your team & routing
Invite your team and define call routing rules — ring groups, IVR menus, and failover paths.
03
Start calling anywhere
Place and receive calls globally from day one, with carrier-grade quality on every route.
Built for teams that run on the phone
- Field services
- Property management
- Healthcare scheduling
- Logistics & dispatch
- Sales & support teams
- Professional services
Everything your team needs to sound sharp on the phone.
One platform that replaces your desk phones, call center software, and business texting app.
Smart call routing & IVR
Build ring groups and business-hour rules with a drag-and-drop editor. No IT ticket required.
Caller
IVR
Ring Group
Agent
Crystal-clear HD calling
Automatic failover between carriers keeps every call clear, even if a route drops.
Real-time analytics
Track call volume, wait times, and team performance.
Team texting & SMS
Send and receive SMS from the same number your team already calls from.
Integrates with your stack
Connect CRMs, helpdesks, and internal tools through open APIs and webhooks.
Keep or port your number
Bring your existing numbers over with zero downtime, anywhere in the world.
SOC 2 Type II certified•GDPR compliant•End-to-end encrypted calls
- Businesses onboarded
- 0+
- Uptime SLA
- 0.00%
- Countries with local numbers
- 0+
- Human support
- 24/7
Trusted by engineering teams worldwide.
“We route over 2 million minutes a month through SMK's trunks. ASR sits above 98% even during regional carrier outages, since failover kicks in before an agent ever notices a dropped leg.”
“Provisioning a new SIP trunk used to take our old carrier two weeks of tickets. With SMK it's a single API call, live in minutes, with OPUS negotiated automatically on every leg.”
Frequently asked questions.
Can't find what you're looking for? Talk to our team.
Yes. SIP-over-WSS signaling traverses restrictive corporate firewalls and NAT without a hardware VPN, so field and remote agents on mobile dialers stay connected even on locked-down networks.
Let's build your voice network.
Tell us about your infrastructure needs. Our engineering team will set up a custom test trunk and routing profile for your business.
Global Support24/7
Response Time< 15 mins