Search for dissertations about: "sip"

Showing result 1 - 5 of 54 swedish dissertations containing the word sip.

  2. 1. Towards Secure SIP Signalling Service for VoIP applications : Performance-related Attacks and Preventions

    Author : Ge Zhang; Simone Fischer-Hübner; Costas Lambrinoudakis; Karlstads universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; SIP; VoIP; Security; Computer science; Datavetenskap; Datavetenskap; Computer Science;

    Abstract : Current Voice over IP (VoIP) services are regarded less secure than the traditional public switched telephone network (PSTN). This is due to the fact that VoIP services are frequently deployed in an relatively open environment so that VoIP infrastructures can be easily accessed by potential attackers. READ MORE

  4. 2. Unwanted Traffic and Information Disclosure in VoIP Networks : Threats and Countermeasures

    Author : Ge Zhang; Simone Fischer-Huebner; Costas Lambrinoudakis; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SIP; VoIP; security; Denial of Service; Vulnerability analysis; timing attacks; Spam; DTMF; SIP; RTP; Computer Science; Datavetenskap;

    Abstract : The success of the Internet has brought significant changes to the telecommunication industry. One of the remarkable outcomes of this evolution is Voice over IP (VoIP), which enables realtime voice communications over packet switched networks for a lower cost than traditional public switched telephone networks (PSTN). READ MORE

  5. 3. A Mobile Agent Based Service Architecture for Internet Telephony

    Author : Roch H. Glitho; KTH; []
    Keywords : service architecture; mobile agent; SIP; H.323; IN; software upgrading; partitioning; multiparty event scheduling;

    Abstract : Internet Telephony defined as real time voice or multimediacommunications over packet switched networks dates back to theearly days of the Internet. ARPA's Network SecureCommunications project had implemented, as early as December1973, an infrastructure for local and transnet real time voicecommunication. Two main sets of standards have emerged: H. READ MORE

  6. 4. Cervical Radiculopathy. Effects of Surgery, Physiotherapy or Cervical Collar. A prospective, randomised study

    Author : Liselott Persson; Neurokirurgi; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; headache.; posturography; neck mobility; strength; SIP; randomised trial; cervical collar; physiotherapy; anterior cervical fusion; Cervical radiculopathy; neck pain; Neurology; neuropsychology; neurophysiology; Neurologi; neuropsykologi; neurofysiologi;

    Abstract : The efficacy of surgery, physiotherapy or a cervical collar in the treatment of chronic cervicobrachial pain of radicular origin was evaluated in a prospective, randomised study comprising 81 patients of both sexes, 28-64 years of age, referred for possible neurosurgical treatment. After neurological and radiological examination and giving their informed consent, they were randomised to one of the three treatments. READ MORE

  7. 5. Plant major intrinsic proteins. Identification and characterization of novel water channel-like protiens

    Author : Sofia Gustavsson; Biokemi och Strukturbiologi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Växtbiokemi; Plant biochemistry; GIP; SIP; GUS; immunolabelling; aquaporin; aquaglyceroporin;

    Abstract : The Major Intrinsic Proteins, MIPs, constitute a large, ancient superfamily of membrane proteins that are found in all kingdoms of life. Most MIPs facilitate passive diffusion of water across biological membranes (aquaporins), although many channels are also permeable for glycerol and other small uncharged solutes, (aquaglyceroporins). READ MORE