3CX vs Microsoft Teams Calling vs Traditional PBX — Which Wins in SA?

The one-paragraph verdict

For most SA SMEs under 100 seats: 3CX wins on total cost and features per rand. If Microsoft 365 is already your platform and you value the single-app experience: Teams Calling is worth the premium. Traditional on-prem PBX (Panasonic, Grandstream UCM, Yeastar) only wins in a very narrow set of cases — usually manufacturing sites with legacy analog dependencies.

3CX — the pragmatist's default

• Licensing (2026): annual per-system fee based on simultaneous calls, not users. Small Business Pro (8 SC): ~R6,900/year; Pro (16 SC): ~R13,500/year; Enterprise unlimited: ~R28,000/year.
• Hosting: self-hosted (small VM at R250/month), 3CX-hosted or partner-hosted. All three are stable.
• SIP trunks: Openline, Euphoria, Switch Telecom, Voys — from ~R1,200/month for 8 concurrent channels including bundled minutes.
• Features: queues, IVR, call recording, native WhatsApp Business inbox, SMS, live chat, MS 365 integration, mobile + desktop softphone, video meetings.
• Wins for: multi-site SA businesses, call-centre-light workflows, businesses that want WhatsApp in one inbox with voice.
• Watch-outs: licence renewal must be tracked; upgrade discipline matters; support quality varies wildly by partner.

Microsoft Teams Calling — the M365 native

• Licensing: Teams Phone Standard ~R150/user/month + either a Microsoft Calling Plan or Direct Routing via an SA SIP provider. Bundled in E5 licences.
• Number model: Direct Routing via Openline / Euphoria / Voys is the SA norm; keeps geographic numbers and gives per-minute billing.
• Features: queues (with Queues app), auto-attendants, call recording via compliance recording partner, deep Outlook + Teams integration, one client for chat/meeting/call.
• Wins for: knowledge-work businesses already on M365 Business Standard/Premium or E-series; hybrid/remote teams; anyone who wants "just Teams" for everything.
• Watch-outs: costs stack quickly (Phone licence + Direct Routing + compliance recording); queue features less mature than 3CX for high-volume inbound.

Traditional on-prem PBX — narrower and narrower

• Hardware: Panasonic KX-NS/HTS, Grandstream UCM, Yeastar P-Series — R15,000–R60,000 capex depending on channel count and handset load.
• SIP trunks: the same SA providers as 3CX; some clients still keep an ISDN or analog line as a "known-good" failover.
• Features: full traditional telephony including analog fax, door-phone integration, hotel-style extensions.
• Wins for: factories with analog paging or intercom systems, hospitality where the PBX must be air-gapped from IT, sites with unreliable internet.
• Watch-outs: dies with the office on load-shedding; every feature upgrade is a truck roll; vendor support windows shrinking industry-wide.

3-year cost comparison — 20 seats, moderate call volume

Rough all-in totals including licences, SIP trunks, minutes, handsets and support:

• 3CX (hosted, Pro): ~R125,000 over 3 years.
• Teams Phone + Direct Routing: ~R210,000 over 3 years (assuming existing M365 Business Standard).
• On-prem PBX (Yeastar P-Series): ~R145,000 over 3 years, but higher year-1 capex and higher failure risk from load-shedding.

Include mobile softphone as standard on all three — hybrid work makes desk-only calling extinct.

How to choose in 5 minutes

1. On M365 Business Premium or E-series already? Teams Calling unless you have a heavy inbound queue.
2. Cost-sensitive, WhatsApp matters, multi-site? 3CX.
3. Manufacturing, hospitality, air-gapped IT? On-prem PBX.
4. Call centre >50 concurrent calls? Neither — look at Genesys, Zoom Contact Center or 8x8.
5. Still unsure? Get 1ICT to run a 60-minute discovery — the right answer is usually obvious once call volume and workflows are on paper.

Frequently asked questions