What is the best open source PBX software?

Compare the Top 10 Best Open Source PBX Software 1 Asterisk 2 Elastix 3 SIPfoundry 4 FreeSWITCH 5 PBXInAFlash 6 OpenSIPs 7 Kamailio 8 FreePBX 9 3CX 10 OpenPBX by Voicetronix
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