NexysCloud

Complete Cloud Communications for Growing South African Businesses

📡 SIP Trunking Services

Replace Expensive Phone Lines With Unlimited, Scalable VoIP Channels

Still paying for outdated, limited telephone lines? NexysCloud's SIP Trunking service connects your existing PBX directly to our network — slashing your call costs, eliminating line limitations, and future-proofing your business communications.

Is Your Current Phone Line Setup Costing You Too Much?

If any of these sound familiar, SIP Trunking is the answer:

  • ❌ Paying per physical phone line, even lines you barely use

  • ❌ Limited to a fixed number of simultaneous calls​

  • ❌ High costs for national, mobile, and international calls

  • ❌ Expensive ISDN or E1 lines that are being phased out

  • ❌ Connecting multiple offices costs a fortune in dedicated lines​

  • ❌ No failover when your primary line goes down

  • ❌ Can't scale up quickly during busy periods

  • ❌ Locked into long-term contracts with your current provider

What Is SIP Trunking?

SIP (Session Initiation Protocol) Trunking is a digital alternative to traditional telephone lines — replacing physical wires and ISDN/E1 connections with internet-based virtual channels. Your existing on-premise or cloud PBX (3CX, Asterisk, FreePBX, or any SIP-compatible system) connects directly to NexysCloud's network via a SIP trunk, enabling calls to and from any phone worldwide.

​

Think of it as replacing 30 expensive fixed phone lines with unlimited virtual channels that scale instantly — at a fraction of the cost.

Why NexysCloud SIP Trunking?

exysCloud's SIP Trunking service is built on one of the world's most trusted and feature-rich telecommunications platforms. This gives NexysCloud customers access to enterprise-grade reliability, fraud protection, and advanced call routing that was previously only available to large telcos.

  • ✅ Unlimited Concurrent Calls — No more "all lines are busy"​

  • ✅ Dramatic Cost Savings — Significantly lower call rates vs. traditional lines​

  • ✅ Works With Your Existing PBX — 3CX, Asterisk, FreePBX, and more​

  • ✅ Instant Scalability — Add channels in minutes, not weeks​

  • ✅ Advanced Fraud Protection — Built-in fraud prevention​

  • ✅ Self-Service Portal — Manage trunks, DIDs, and usage online​

  • ✅ 99% Uptime SLA — Redundant infrastructure ​

  • ✅ Local SA Support — Real people, fast response, based in South Africa

  • ✅ Flexible Contracts — Month-to-month options, no lock-ins

Key Features

📞 Core SIP Trunking

  • Unlimited Concurrent Channels — Handle any call volume simultaneously​

  • Inbound DID Numbers — Local, national, and toll-free numbers​

  • Outbound Call Termination — Local, mobile, national, and international calling​

  • Number Porting — Keep your existing business numbers

  • Caller ID Management — Present your business number on all outbound calls

  • Multi-Branch Connectivity — Connect all offices at zero per-minute internal cost

🔀 Advanced Call Routing

  • Failover Routing — Automatically reroute calls during outages​

  • Time-Based Routing — Route calls differently during business hours vs. after hours

  • Geographic Routing — Route calls based on caller location

  • Load Balancing — Distribute calls across multiple destinations​

  • Hunt Groups — Ring multiple extensions simultaneously or in sequence

  • On-Demand SIP Trunk Provisioning — Spin up new trunks instantly via portal

🔒 Security & Fraud Prevention

  • Real-Time Fraud Detection — NexysCloud monitors and blocks suspicious activity​

  • Call Spend Limits — Set daily/monthly limits to prevent runaway bills​

  • IP Whitelisting — Only authorised IPs can connect to your trunk​

  • Encrypted SIP (SRTP/TLS) — Secure, encrypted voice calls​

  • Compromised PBX Protection — Automatic blocking of fraudulent call patterns

📊 Reporting & Management

  • Self-Service Web Portal — Manage DIDs, channels, and settings online​

  • Real-Time Call Statistics — Live dashboards and usage monitoring​

  • Detailed CDRs — Full call detail records for billing and analysis​

  • Usage Alerts — Notifications when approaching spend limits​

  • Online Billing & Payments — View invoices and manage payments via portal

🔴 Hybrid Fibre + LTE Failover

The ultimate business continuity solution — primary fibre with automatic LTE backup.

  • Zero downtime during load shedding or fibre disruptions​

  • Automatic failover — switches to LTE in seconds

  • Calls, payments, cloud tools stay online

  • Single monthly bill — fully managed by NexysCloud

  • Recommended for all business-critical operations

🔗 Compatibility

  • Works With Any SIP-Compatible PBX — 3CX, Asterisk, FreePBX, Yeastar, and more​

  • Microsoft Teams Direct Routing — Connect Teams to PSTN via SIP​

  • Cloud & On-Premise PBX Support — Fully flexible deployment​

  • Fax-to-Email — Digital fax over SIP trunk​

  • API Access — Integrate with business systems via API

How It Works

Step 1: Free Assessment
We assess your current telephony setup — existing PBX, call volumes, number of simultaneous calls needed, and call destinations — completely free.

Step 2: Trunk Configuration
We configure your SIP trunk and assign your DID numbers, set up call routing rules, and provision your channels to match your requirements.

​

Step 3: PBX Integration
We connect your SIP trunk to your existing PBX system (3CX, Asterisk, FreePBX, or any SIP-compatible system). Most integrations are completed remotely within hours.

​

Step 4: Testing & Go-Live
We thoroughly test inbound and outbound calling, failover routing, and fraud controls before going live — ensuring zero disruption to your business.

Step 5: Ongoing Management
Manage your trunk, DIDs, and usage via the self-service portal, backed by NexysCloud's local SA support team.

SIP Trunking vs. Traditional Phone Lines

Feature

Max simultaneous calls

Scalability

Cost

International calls

Failover routing

Fraud protection

Multi-branch connectivity

Self-service management

Contract flexibility

Traditional ISDN/E1

30 (PRI), 2 (BRI), 1(Analog)

Weeks, requires hardware

High fixed monthly fees

Very expensive

Not available

None

Expensive dedicated lines

Not available

Long-term lock-ins

NexysCloud SIP Trunking

Unlimited

Minutes, via portal

Pay for what you use

Competitive per-minute rates

Automatic

Built-in

Zero per-minute internal cost

Full web portal

Month-to-month available

Who Is This For?

NexysCloud SIP Trunking is the perfect fit for:

  • 🏢 Businesses with existing PBX systems (3CX, Asterisk, FreePBX) looking to reduce costs

  • 📞 Call centres needing unlimited concurrent channels at peak times​

  • 🏗️ Multi-branch businesses wanting free internal calls between locations​

  • 🌍 Businesses making frequent international calls needing lower rates​

  • 💼 Microsoft Teams users needing Direct Routing to PSTN​

  • 🔄 Businesses migrating from ISDN/E1 as traditional lines are phased out

  • 🏥 Healthcare & financial services needing secure, encrypted voice calls​

  • 📈 Growing businesses that need to scale call capacity without hardware upgrades

Frequently Asked Questions

Do I need to replace my existing PBX?
No. SIP Trunking connects directly to your existing PBX — whether it's 3CX, Asterisk, FreePBX, or any SIP-compatible system. You keep your current setup and simply replace your old phone lines with SIP.

​

What is a SIP channel?
A SIP channel is a virtual phone line — one channel supports one simultaneous call. If you need to handle 10 calls at the same time, you need 10 channels. Unlike traditional E1 lines capped at 30 calls, NexysCloud SIP Trunking supports unlimited concurrent channels.

​

Can I keep my existing phone numbers?
Yes. We offer full number porting so all your existing business numbers move across seamlessly.

What happens if my internet goes down?
Failover routing automatically redirects calls to an alternative destination — a mobile number, another office, or a backup line — ensuring no calls are missed.

​

How does NexysCloud protect against fraud?
NexysCloud's built-in fraud detection monitors call patterns in real time, blocking suspicious activity automatically. You can also set spend limits and IP whitelisting to add additional layers of protection.

Can I connect Microsoft Teams via SIP Trunking?
Yes. NexysCloud supports Microsoft Teams Direct Routing via SIP, connecting your Teams environment directly to the PSTN through our platform.

​

How quickly can I get started?
Most SIP trunk setups are completed within 24–48 hours. Number porting typically takes 5–10 business days depending on the current carrier.

Can I manage everything myself?
Yes. Our self-service portal lets you manage trunks, DIDs, call routing, spend limits, and billing — all online, 24/7.


Ready to Transform Your Business Communications with NexysCloud?

Schedule a free consultation to discuss your tcommunications needs and discover how we can help your business thrive.