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SIP (Session Initiation Protocol) is an IETF for IP telephony fundamental for signaling and control of multimedia sessions, works under a request-response model and is based on a text that uses UTF-8 encoding and ASII format, similar to HTTP, and is still responsible for starting, ending and modifying sessions without knowing their details.

It makes telephone calls, allows communication by audio, text, and video, in different media and applications, the multimedia inclusion of the SIP is evolutionary, so it opens doors to the development of many areas and industry, not only in telecommunications but also in more supplied areas and seeking telecommunication adaptation. It excludes the need for a protocol to handle a generalized session because it is also capable of working with different IP telephony protocols, is lightweight and handles these protocols, and organizes them to perform certain tasks.

It is compatible with PSTN and its address is URL, it has communication primitives that can be used for voice and video, it is beneficial because of its efficiency, simplicity, stability, flexibility, and ease of communication with its protocols, in addition to having independence in the transport protocol, which many systems do not have, therefore, SIP replaces the previous H.323 protocol.

Despite being closely linked to VOIP, these technologies have some differences, SIP transfers much media data (voice, video, and text), while VOIP uses only protocols for voice communications, since SIP requires a level of investment in IT operations, unlike VOIP.

SIP is a formal protocol that supports VOIP, in fact, this IETF was designed for VOIP and more diversified sessions, the use of both in an integrated manner results in significant cost reductions for customers, in addition to improving the quality and efficiency of communications, also enable options such as meetings and connections with people located in different parts of the world, even local, national or international, in addition to long-distance calls. This integration also unites the quality and optimization of telephone services and enables cost-effectiveness.

An example of the use of VOIP in SIP is SIP phones that connect devices to VOIP networks.

Raspberry PI, or simply RPI, is a complete microcomputer model integrated with a single logic board, which aims to promote and diffuse academic teaching of computer science, for learning in schools, thus enabling accessible science access information to education systems around the world, which can be seen in many institutions, although not widely used in undeveloped countries, has contributed to the expansion of knowledge for students. The Raspberry PI is a system that has versatility and low cost.

In its unique card structure, it contains a processor, a RAM memory base, video card, USB inputs, HDM, audio, and more, in addition to being used as a normal computer, it can be connected to a mouse, to a monitor which can also be via tv, keyboard, and other various components. Raspberry PI has three main models, the original Model B, which has the most powerful and modern configuration, PI Zero, which is the miniature version, that also carries three variations: RPI Zero, RPI Zero W, and RPI Zero WH. RPI can be used to create your own PBX to run on your central call system. Raspberry PI is a good option for VOIP businesses.

It is by far the best solution to create your own PBX, which you can structure and customize it any way you want, in addition to being able to be used to serve with PBX devices for a central call of VOIP networks. Its resources are Flexibility, customization, adaptation and implementation of free security protocols, in addition to being compatible with Linux.

VOIP at RPI provides PBX services such as traffic control, call routing that can benefit companies with call transfer possibilities, with access to management, distribution, and advanced call features.

Analysis

These two systems are widely used worldwide, SIP and Raspberry PI are strictly interconnected, apart from the fact that SIP is a Raspberry customer, both offer high-scale VOIP services, the Raspberry PI stands out with its computerized and developed structure, in addition of having a great quality, and opening many doors for VOIP technologies, on the other hand, we have SIP, which excels VOIP services and manages to bring possibilities somewhat above those of VOIP, no matter how much they need each other to exercise their functionalities.