Cisco VoIP PBX is ranked 2nd in IP PBX while Yeastar S-Series VoIP PBX is ranked 3rd in IP PBX. Cisco VoIP PBX is rated 8.0, while Yeastar S-Series VoIP PBX is rated 0.0. The top reviewer of Cisco VoIP PBX writes "Provides support for help/service desk to be knowledgeable about all eGov infrastructure". On the other hand, Cisco VoIP PBX is most compared with 3CX Live Chat and Yeastar K2, whereas Yeastar S-Series VoIP PBX is most compared with 3CX Live Chat.
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