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![]() Date: 2013-01-23 12:04:21Session Initiation Protocol Back-to-back user agent SIP connection Comparison of VoIP software IP Multimedia Subsystem Voice over IP Videotelephony Telephony | Source URL: telestax.wpengine.netdna-cdn.comDownload Document from Source WebsiteFile Size: 583,29 KBShare Document on Facebook |