As more and more businesses move their communications to the cloud, the choice of the right telephone system has become a strategic decision. Every year, the specialist magazine connect professional runs an extensive comparison test to identify the leading Cloud PBX providers.
In the 2025 edition, the STARFACE Cloud telephone system once again delivered an outstanding performance — earning top marks and the coveted overall rating “Outstanding”.
The best Cloud PBX providers in Germany
Together with telecom testing experts zafaco, connect professional evaluated the technical performance and service quality of the country’s top Cloud PBX and SIP trunk providers. This year’s ranking:
- Telekom
- STARFACE
- Plusnet
- Enreach
- Sipgate
- 1&1 Versatel
- O2 Telefónica
- NFON
- Easybell
- RingCentral
Best connection quality
When it comes to internal Cloud PBX calls, STARFACE achieved a perfect score of 160/160 — securing first place ahead of Telekom. For external connections to other providers and landline networks, STARFACE was only two points behind the top spot.
Crystal-clear voice quality
The STARFACE Cloud PBX, coupled with its proprietary SIP trunk solution STARFACE Connect, delivered the highest voice quality for internal calls in the entire test field — crucial for businesses that rely on flawless communication.
Industry-leading availability
Across 500,000 test calls over a month, STARFACE achieved an impressive 99.99% uptime, trailing Telekom by just 0.01%.
The verdict: “Outstanding”
With 970 out of 1,000 points, STARFACE shares the top position in Germany with Telekom — despite not operating its own carrier network.
“STARFACE demonstrated exceptional results across all telephony test cases,” notes zafaco’s report. “Performance for internal and external connections as well as landline calls was outstanding. Mobile calls were slightly lower but still rated very good. Stability is extremely high across both office and home office environments — with virtually constant availability. Compared to last year’s mid-table ranking, this is a remarkable leap to second place.”
How testing works
To ensure realistic results, the test measured over 50 performance indicators in four practical scenarios:
- On-Net (within the same Cloud PBX)
- Off-Net (between Cloud PBX providers)
- Off-Net Fixed (to/from the national landline network)
- Off-Net Mobile (to/from the four major mobile networks: Telekom, O2 Telefónica, Vodafone, and 1&1)
A smart choice for professional communication
With consistently excellent voice quality, lightning-fast connections, and near-perfect reliability, the STARFACE Cloud PBX is a stand-out choice for businesses that demand high performance, seamless system integration, and communications they can truly depend on.