Back-to-back user agent

#	Item
21	WHITE PAPER SERIES SIP An Introduction Add to Reading List Source URL: www.konnetic.com Language: English - Date: 2010-11-02 03:54:01 Telephony Session Initiation Protocol Domain name system IP Multimedia Subsystem Back-to-back user agent SIMPLE SRV record NAPTR record User agent Voice over IP Electronic engineering Videotelephony
22	PDF Document Add to Reading List Source URL: www.konnetic.com Language: English - Date: 2010-11-02 03:54:01 Telephony Session Initiation Protocol Domain name system IP Multimedia Subsystem Back-to-back user agent SIMPLE SRV record NAPTR record User agent Voice over IP Electronic engineering Videotelephony
23	PDF Document Add to Reading List Source URL: www.frafos.com Language: English - Date: 2012-10-22 11:10:00 Session Initiation Protocol Session border controller Back-to-back user agent SIMPLE VoIP User VoIP phone IP Multimedia Subsystem Brekeke SIP Server Voice over IP Videotelephony Telephony