The present paper begins with telecommunications system's development description history from the very beginning to today's telephone exchanges and their parts, which enable the complete transmission of speech, data and signaling. Furthermore, the paper describes signaling techniques, which are divided into the associated channel signaling and common channel signaling. In addition to defining the SS7 signaling system as an international signaling standard with CCS type of signaling between switching nodes, paper also describes the development of networks and the separation of the control and transmission part of the network. As part of the SS7 system, the ISUP protocol is described in the paper, which is intended for applications in channel-switched data networks and for analog and analog-digital networks, enabling signaling functions for ISDN services. The components of the ISUP messages and the ISUP message stack are described below. In the last chapter we come to the topic of the subject work, the BICC protocol, which is an upgrade to the already described ISUP protocol. The most important upgrade of the BICC protocol is a completely separate call control from the switching control in the PSTN/ISDN network. The architecture of the BICC protocol and its development are further described. Switching setup procedures in ATM and IP networks are described along with the types of switching for individual cases, as well as the structure and stack of BICC messages. The last segment of the theoretical part of the paper describes the H.248 protocol, which was developed as a connection between a media gateway and a media gateway controller. It was introduced due to the need to reduce the number of protocols used in IP telephony, which caused the process to slow down. At the very end of the work, there is a practically recorded signaling via the BICC protocol when establishing a call between the fixed and mobile network.