Digium Asterisk is ranked 3rd in Unified Communications while Kamailio SIP Server is ranked 2nd in Unified Communications. Digium Asterisk is rated 8.0, while Kamailio SIP Server is rated 10.0. The top reviewer of Digium Asterisk writes "Call recording, call logging, and the stability are pivotal features for our clients". On the other hand, the top reviewer of Kamailio SIP Server writes "The server itself does load balancing however building a fail-over for it is difficult". Digium Asterisk is most compared with Fortinet FortiVoice, 3CX Live Chat, Cisco Unified Communications, Mitel Application Suite and Skype for Business, whereas Kamailio SIP Server is most compared with 3CX Live Chat, Cisco Jabber, Skype for Business, Genesys PureConnect and Huawei SoftCo.
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