Cisco Unified Communications is ranked 4th in Unified Communications while Siemens OpenScape is ranked 10th in Unified Communications. Cisco Unified Communications is rated 9.0, while Siemens OpenScape is rated 0.0. The top reviewer of Cisco Unified Communications writes "I find the ability to block incoming calls based on the originating number to be the best feature, but the reporting system needs to be more in-depth". On the other hand, Cisco Unified Communications is most compared with Fortinet FortiVoice, Cisco Jabber, Digium Asterisk, Skype for Business and Alcatel-Lucent OmniPCX Enterprise Communication Server, whereas Siemens OpenScape is most compared with .
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