The aim of this diploma thesis is to get accustomed with the SIP protocol and with the problematics of attacks targeting this protocol, with the emphasis on DoS and DDoS attacks. The thesis focuses on detailed classification of the attacks, possibilities and forms of generation of the attacks and methodics of defense against them. The attacks of the flood type are especially stressed because they are easily generated and the SIP components are very prone to these attacks. Prototype implementations of the most important ideas concerning attack generation and protection against these attacks are also part of this thesis. Practical tests of the implementations performed in a simulated SIP environment are also included. 1

Workshop Mensch-Computer-Vernetzung Stand und Perspektiven des Einsatzes einer "Voice over IP"-Lösung für die Telefonie am URZ der TU Chemnitz auf Grundlage der VOCAL-Server-Suite

ENUM is the mapping of a telephone number from the PSTN to Internet services-telephone number in, URL out. It was developed as a solution to the question of how to find services on the Internet using only a telephone number. / Workshop "Netz- und Service-Infrastrukturen" ENUM = tElephone NUmber Mapping, definiert die Vorschrift, mit der eine klassische Telefonnummern auf eine Domain eindeutig abgebildet wird (dafür wird DNS genutzt). Das Ziel dabei ist, verschiedene Adressen, Nummern und URLs eines Benutzers unter einer einzigen Rufnummer verfügbar zu machen.

Thesis (doctoral)--Universität St. Gallen, 1996.

The diploma thesis focuses on the VoIP technology optimization and performance management. The diploma thesis presents the theoretical basis of IP telephony and measurement of its quality. The thesis primarily deals with practical measurements of VoIP calls quality. Asterisk softswitch, various types of IP phones and simulated degradation of signal using Linux software router are used for measurements. Procedural diagram of VoIP technology real deployment is designed based on these measurements.

Master's Thesis is engaged on possibilities connect SIP server to telephone network on FIT. The main reason is that employees can call to university, when they are out of faculty. For resolution we will use SIP server Asterisk, which will be serving as authorization server for users. Next Asterisk will ensure transmission numbers to SIP address with ENUM. In the practical part we will verify the functionality.

Proefschrift Rijksuniversiteit Groningen. / Met lit.opg.

In this graduation thesis wants introduce possibilities of voice transportation in IP networks like Internet. There are described behaviors of IP network, internet connectivity possibilities, voice protocols included Skype and economical outputs. There are mapped positives and negatives of technology including implementation issues. All economic comparisons are made to Telefonica O2 Czech Republic Inc., which is still telecommunication company with majority in the Czech Republic. There are compared samples of VoIP providers with preferences like company live time, lowest cost and guaranteed quality. Description starts with model situation and continues to real case studies. Case studies describe economic calculation, implementation and target analysis. There are three case studies: small company with fast migration in one time, medium company witch accelerated migration in two steps and large company with conservative and control migration in three steps.

Workshop Mensch-Computer-Vernetzung Stand und Perspektiven des Einsatzes einer "Voice over IP"-Lösung für die Telefonie am URZ der TU Chemnitz auf Grundlage der VOCAL-Server-Suite

ENUM is the mapping of a telephone number from the PSTN to Internet services-telephone number in, URL out. It was developed as a solution to the question of how to find services on the Internet using only a telephone number. / Workshop "Netz- und Service-Infrastrukturen" ENUM = tElephone NUmber Mapping, definiert die Vorschrift, mit der eine klassische Telefonnummern auf eine Domain eindeutig abgebildet wird (dafür wird DNS genutzt). Das Ziel dabei ist, verschiedene Adressen, Nummern und URLs eines Benutzers unter einer einzigen Rufnummer verfügbar zu machen.