VoIP, by definition, is the term standing for making or receiving phone calls over the internet or internal networks. It stands for Voice over Internet Protocol, in short.
SIP is an application layer protocol serving for multimedia sessions including VoIP calls. It stands in short for Session Initiation Protocol.
The term SIP, or SIPs, is often a shortcut meaning SIP Trunks. The term ‘trunk’ in itself is misleading as it has no distinct physical form but relates to the ability for two endpoints to make and receive telephone calls over an IP connection. The use of SIP Trunks requires a specific, reliable endpoint, usually a telephone system, and for resilient services a reliable data connection is necessary.
SaaS (Software as a Service), in essence, is quickly becoming the next generation of telephone calls. Essentially, the services are native cloud, and telephone calls are made and in reception from an App using:
- any internet connection, or;
- through a telephone system.
Moreover, telephone handsets working on SaaS are an App set up to work in a physical handset instead of a desktop or mobile. SaaS solutions also often use SIP as technology. You would usually deploy on a network that you share with data.
Hosted telephone systems usually use SIP to connect a specific handset to a network-based telephone system, often requiring a reliable data connection.
UC solutions (Unified Communications, voice/e-mail/instant messaging / chat), by their nature of being multimedia, are SaaS usually using SIP.
These are, in effect, the newer technologies in use to replace traditional business telephone systems. In short, these use TDM – Time Division Multiplexing – which is the protocol in use by ISDN telephone lines.
Gateways are available to connect SIP and SaaS to the existing telephone system.
We hope this helps.