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SaaS	Software as a Service (SaaS) is a software distribution model in which applications are hosted by a vendor or service provider and made available to customers over a network, typically the Internet.
SDSL	Symmetric Digital Subscriber Line - a form of Digital Subscriber Line (DSL) service that provides equal bandwidth for both uploads and downloads.
SIP	SIP, the session initiation protocol, is the IETF protocol for VOIP and other text and multimedia sessions, like instant messaging, video, online games and other services. SIP uses port 5060 both for UDP and TCP
SSL VPN	Secure Socket Layer VPN is a form of VPN that can be used with a standard Web browser. In contrast to the traditional Internet Protocol Security (IPsec) VPN, an SSL VPN does not require the installation of specialized client software on the end user's computer. It's used to give remote users with access to Web applications, client/server applications and internal network connections.