Deutsche Telekom Certifies Interoperability with Yeastar S-Series VoIP PBX
XIAMEN, CHINA / DALLAS, US – April 12, 2018 – Yeastar (www.yeastar.com), a leading manufacturer of VoIP PBX systems and VoIP Gateways, is now fully compatible with all SIP service provided by Deutsche Telekom, the Europe’s largest telecommunications company and…