VoIP PBX Systems:
Find the Right Fit
for Your Business
An independent, in-depth comparison of the world's leading IP PBX platforms for small and medium businesses — features, pricing, scalability, and use-case guidance.
Choosing the right VoIP PBX system can be the most impactful technology decision your business makes this year. Modern IP PBX platforms go far beyond basic phone calls — they unify communications, integrate with CRMs, support remote teams, and deliver enterprise-grade collaboration tools at SMB-friendly costs.
In this guide we compare the five leading VoIP PBX platforms for SMBs: Grandstream, Yeastar, MITEL OpenScape Business, KAREL, and 3CX. We analyse feature sets, pricing, scalability, hardware ecosystems, and real-world suitability so you can choose with confidence.
TekkPak Technologies is an authorised partner for all five platforms. Our goal is to find the solution that fits your business — not to push any single brand.
The Case for Modern VoIP PBX
Legacy phone systems are being phased out. Here's why forward-thinking SMBs are switching to IP PBX.
Up to 60% Cost Savings
VoIP calls cost a fraction of PSTN. Internal calls over IP are free, international rates drop, and zero per-seat licensing means immediate ROI.
Scales With Your Business
Add extensions, locations, or branches without procurement delays. Software-defined PBX grows in minutes — ready when you are.
Remote-Work Ready
Mobile apps, softphones, and WebRTC turn any device into a business extension — in-office, at home, or internationally.
Deep Integrations
Connect with Salesforce, HubSpot, Microsoft Teams, and hundreds of business tools via APIs and native connectors.
Real-Time Analytics
Live dashboards, call recording, wallboards, and detailed reporting help managers make data-driven decisions.
Enterprise Security
TLS/SRTP encryption, intrusion detection, SIP trunking, and automated fail-over keep communications secure and always online.
Your Trusted Partner for Every Platform
Why Choose TekkPak Technologies?
Authorised reseller for Grandstream, Yeastar, MITEL OpenScape, KAREL, and 3CX. Not tied to any single vendor — our advice is guided by what's right for your business.
- Authorised for all 5 platforms in Pakistan
- Vendor-neutral — we recommend based on your needs, not our margins
- End-to-end: supply, installation, configuration, training, and support
- Free consultation to shortlist the right platform for your business
- Proven deployments in finance, healthcare, retail, education, and more
- AI-powered WhatsApp chatbot for instant quotes and guidance 24/7
All 5 VoIP PBX Systems Reviewed
An honest, balanced breakdown of features, strengths, and ideal use cases for each platform.
Grandstream UCM6300 appliances support up to 3,000 users and 450 concurrent calls with zero software licensing costs. The industry's most complete hardware ecosystem — IP phones, DECT, video phones, door intercoms — all managed free via GDMS cloud.
- Best For
- On-premise deployments
- Hardware-centric setups
- Zero-license budgets
- Call centres & SMBs
- Consider If
- Pure cloud PBX needed
- Software-only deployment
3CX is a software PBX licensed by simultaneous calls (SC), scalable to 1,024+ concurrent calls per instance. Runs on Windows, Linux, or cloud. Excels at unified communications — video meetings, live web chat, and WhatsApp Business in a single platform.
- Best For
- Digital-first businesses
- Remote/hybrid teams
- WhatsApp + web chat
- MS Teams environments
- Consider If
- Own hardware preferred
- On-premise appliance needed
- No server to host
MITEL OpenScape Business is an award-winning all-in-one UC solution for SMBs — 2–500 users per system, up to 2,000 networked. Available as appliance, software, VM, or hosted cloud. Integrates natively with Microsoft Teams via myPortal for Teams.
- Best For
- SMB-focused UC
- Multi-site networked setups
- MITEL migrations
- Consider If
- Very tight SMB budget
- No IT resource on-site
- Hardware ecosystem priority
Yeastar P-Series covers on-premise appliances (P550–P570) and a software edition. The P570 supports 500 users and 120 concurrent calls; the software edition scales to 10,000 extensions. Linkus UC client delivers a polished experience but advanced call centre features need a paid plan.
- Best For
- Hybrid cloud/on-prem
- Clean UC experience
- Smaller SMBs
- Consider If
- Advanced call centre without add-on cost
- Broad hardware range required
- Avoiding annual subscriptions
KAREL is a major Turkish PBX manufacturer — one of Europe's top 3 PBX brands. IPG series: up to 2,000 IP ports per rack (32,000 total platform capacity); DS200 series: up to 750 IP extensions. Karel Mobile app (iOS/Android) and Cloud PBX both available.
- Best For
- PSTN/analogue migration
- Regional-market deployments
- Large TDM + IP hybrid sites
- Consider If
- Full modern UC suite needed
- WhatsApp/Teams integration required
- Advanced call centre analytics
Full Feature Comparison Table
Verified features, specs, and figures across all 5 platforms.
| Feature / Capability | Grandstream | 3CX | MITEL OpenScape | Yeastar | KAREL |
|---|---|---|---|---|---|
| 💰 Pricing & Licensing | |||||
| Software License Cost | $0 / Free | Annual SC-based license | Perpetual or subscription | Annual subscription | One-time (hardware-based) |
| Deployment Models | On-premise appliance + GDMS cloud mgmt | Own server / cloud / 3CX hosted | Appliance, software, VM, hosted, cloud | Appliance (P550–P570), software, cloud | On-premise appliance + Karel Cloud PBX |
| Cloud / Hosted Option | GDMS + UCM RemoteConnect | 3CX Hosted | MiCloud / private cloud | P-Series Cloud Edition | Karel Cloud PBX |
| Total Cost of Ownership | |||||
| 📶 Capacity & Scalability | |||||
| Max Extensions / Users | 3,000 (UCM6308)UCM6300A: 500 / UCM6308A: 1,500 / UCM6308: 3,000 | Scales with licensed SC tierExtensions capped per SC count (~1:5 ratio) | 500 per system; 2,000 networkedOpenScape Business SMB product | 500 (P570 appliance); 10,000 (software)P550: 50 / P560: 200 / P570: 500 | 2,000 IP ports (IPG1000); 750 IP ext. (DS200M)IPG platform: up to 32,000 total ports |
| Max Concurrent Calls | 450 (UCM6308)UCM6300A: 120 / UCM6308A: 200 / UCM6308: 450 | Up to 1,024 SC per instanceScalable beyond via bridged deployments | Server/appliance dependentCovers typical SMB concurrent call volumes | 120 (P570); 1,000 (software ed.)P550: 25 / P560: 60 / P570: 120 | Varies by modelDS200M: 750 IP ext.; IPG1000: 2,000 IP ports |
| Multi-Site / Branch Support | Native peering | Centralised or distributed | IP bridge between sites | ||
| High Availability / Failover | Hot-standby HA built-in | Cloud-based only | Active-standby HA | HA (software ed.) | Optional redundancy (IPG1000) |
| 📞 Core PBX Features | |||||
| Auto Attendant / IVR | Multi-level, multi-language | ||||
| Call Queuing & ACD | Advanced, free | Enterprise plan for advanced | Via EVM200 module | ||
| Call Recording | Built-in, free | ||||
| Voicemail to Email | |||||
| Fax over IP (T.38) | T.38 fax server | ||||
| Paging / Intercom | Native | Via multicast | |||
| Hot Desking | |||||
| 🤝 Unified Communications & Collaboration | |||||
| Built-in Video Conferencing | Grandstream Wave | OpenScape Web | Linkus (Enterprise/Ultimate) | Via SIP video endpoints | |
| Mobile App (iOS & Android) | Wave App | 3CX App | OpenScape Mobile | Linkus | Karel Mobile |
| Desktop Softphone / UC Client | Wave (Win/Mac/Web) | myPortal for Desktop | Linkus Desktop | Windows PC App | |
| Instant Messaging / Team Chat | Ultimate plan | ||||
| Presence / Status | |||||
| MS Teams Integration | Via SBC / 3rd party | Native direct routing | myPortal for Teams | ||
| WhatsApp Business | Via partner / API | Native | |||
| 📊 Call Centre & Analytics | |||||
| Live Wallboard / Dashboard | Built-in, free | Enterprise plan | Via web-CM reporting | ||
| Skill-based Routing | Enterprise plan | ||||
| Supervisor Listen / Whisper / Barge | Enterprise plan | ||||
| CDR Reporting & Analytics | Advanced, free | Advanced | Web-CM / Net-CM | ||
| CRM Integration | Salesforce, Zoho, Sugar, vtiger | Zoho, Salesforce, HubSpot | Via CTI | ||
| REST API / Webhook | Workflow Studio | ||||
| 📱 Hardware Ecosystem | |||||
| IP Phones Portfolio | 50+ models (GXP / GRP series) | 3rd party SIP phones only | OpenScape CP series (wired, DECT, Wi-Fi) | Limited native; broad 3rd party support | Karel FT, ST, NT digital & IP phones |
| Video Desk Phones | GXV series | Via SIP videophones | |||
| DECT Cordless Phones | DP series | OpenScape DECT | |||
| Video Conferencing Endpoints | GVC series | ||||
| IP Door Intercoms / Access Control | GDS series | ||||
| 🔐 Security & Reliability | |||||
| TLS / SRTP Encryption | |||||
| Intrusion Detection / IPS | Built-in | Auto + Static Defense | |||
| LDAP / Active Directory | |||||
| ⭐ Final Verdict | |||||
| Overall Score (SMB) | |||||
Specs verified from official vendor documentation as of 2026. Yes | Partial/Add-on | No
Grandstream UCM6300 Feature Deep Dive
The UCM6300 series leads our 2026 comparison. Here's why it tops the chart for SMBs.
Core Telephony & PBX Features
Everything an SMB needs out of the box — zero extras
Grandstream UCM6300 appliances include advanced multi-level IVR, time-based call routing, call parking, ring groups, call forwarding, and full SIP trunk management supporting SIP, PRI, BRI, FXO, and FXS — at zero licensing cost.
Unified Communications (UC)
Grandstream Wave: voice, video, chat — one app, zero cost
Grandstream Wave is the fully integrated UC client for iOS, Android, Windows, Mac, and web browsers. It unifies voice, HD video meetings, instant messaging, and presence status — at no additional licence cost. The GVC room systems extend this into meeting rooms.
Call Centre Suite
Advanced agent tools, wallboard & analytics — all free
The UCM6300 includes a comprehensive call centre module at no extra cost — real-time live wallboard, agent status visibility, queue performance statistics, SLA tracking, detailed historical reports, and supervisor listen/whisper/barge — all included as standard.
Security, HA & Cloud Management
Enterprise-grade protection with free GDMS cloud platform
TLS encrypts all SIP signalling; SRTP protects all media. Built-in IPS blocks malicious SIP traffic and brute-force attacks. Hot-standby HA ensures zero call loss. GDMS is a free cloud platform for remote management of every device from a single dashboard.
Complete Hardware Ecosystem
The most comprehensive IP hardware portfolio in the market
No other VoIP PBX vendor offers a hardware ecosystem as complete as Grandstream's — from entry-level IP phones to 4K video phones, DECT handsets, room conferencing systems, ATAs, IP paging, and door intercoms with access control. All managed centrally via UCM and GDMS.
3CX: Purpose-Built for Digital Teams
For businesses preferring a software-based approach — on their own servers, a VPS, or fully in the cloud — 3CX is an excellent fit. Licensed by simultaneous calls (SC), scaling to 1,024+ concurrent calls per instance.
3CX delivers rich UC including HD video meetings, live web chat, and WhatsApp Business. Hardware-agnostic — compatible with virtually any SIP IP phone. Especially compelling for remote teams and MS Teams environments.
TekkPak Technologies is an authorised 3CX solution partner in Pakistan — end-to-end licensing, deployment, configuration, and after-sales support.
3CX Highlights
Software PBX · Video · Live Chat · WhatsApp
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Let Us Help You Choose the Right System
As authorised partners for all five platforms, TekkPak Technologies gives you truly independent advice — competitive pricing, professional installation, and dedicated after-sales support.
© 2026 TekkPak Technologies · Authorised Partner: Grandstream · Yeastar · MITEL OpenScape · KAREL · 3CX
All specifications verified from official vendor documentation as of 2026. Scores based on independent editorial assessment of SMB suitability, TCO, feature completeness, and support ecosystem.