<![CDATA[session initiation protocol call flow Resources | ZDNet]]> en-us <![CDATA[Investigate and implement Session Initiation Protocol (SIP) gateways]]> Thu, 31 Aug 2006 00:00:00 -0700 CSCO CSCO <![CDATA[Cisco - SIP Introduced With Cisco PGW 2200 Softswitch and VISM Configuration]]> Mon, 07 Jun 2004 00:00:00 -0700 CSCO CSCO