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Showing result 1 - 5 of 10 essays matching the above criteria.

  1. 1. A reverse proxy for VoIP : Or how to improve security in a ToIP network

    University essay from KTH/Kommunikationsnät

    Author : Guillaume Dhainaut; [2016]
    Keywords : VoIP; ToIP; SIP; SIPS; RTP; SRTP; SBC; session border controller; security; toll fraud;

    Abstract : The need for security is crucial in Telephony over IP (ToIP). Secure protocols have been designed as well as specific devices to fulfill that need. This master thesis examines one of such devices called Session Border Controller (SBC), which can be compared to reverse proxies for ToIP. The idea is to apply message filters to increase security. READ MORE

  3. 2. The Intelligent Use of Multiple Interfaces : Using multiplexing to reduce the overhead for small packets

    University essay from KTH/Radio Systems Laboratory (RS Lab)

    Author : Niyaz Adigozalov; [2013]
    Keywords : Long-Term Evolution; LTE; multiplexing; VoIP; overhead; RTP; VPN; WLAN; Long-Term Evolution; LTE; multiplexa; VoIP; ooptimerad; RTP; VPN; WLAN;

    Abstract : Long-Term Evolution (LTE) is the latest development in wide area cellular mobile network technology. In contrast with the earlier generations of circuit-switched mobile networks, LTE is all-IP packet-switched network. Both voice and data are sent inside IP packets. Voice over IP (VoIP) is used to provide voice service to LTE users. READ MORE

  4. 3. Green VoIP : A SIP Based Approach

    University essay from KTH/Kommunikationssystem, CoS

    Author : Goce Talaganov; [2012]
    Keywords : SME; home; VoIP; SIP; energy efficiency; low-power; IP telephony system; WRT54GL; DD-WRT; cloud services;

    Abstract : This master thesis presents, examines, designs, implements, and evaluates with respect to energy efficiency a secure and robust VoIP system. This system utilizes a Session Initiation Protocol (SIP) infrastructure assisted by a cloud service, specifically focusing on small to medium sized enterprises (SME) and homes. READ MORE

  5. 4. Fast Packet Retransmissions in LTE

    University essay from Kommunikationssystem

    Author : Syed Tamoor-ul-Hassan; Serkan Demir; [2011]
    Keywords : Link Adaptation; HARQ; EHF; FTP; VOIP;

    Abstract : The cellular networks are evolving to meet the future requirements of data rate,coverage and capacity. The fourth generation mobile communication system, LTEhas been developed to meet these goals. LTE uses multiple antenna features andlarger bandwidths in order to accomplish this task. READ MORE

  6. 5. Impact and Multiplexing of SIP Signaling in GSM

    University essay from Institutionen för teknik och naturvetenskap; Tekniska högskolan

    Author : Pasha Ayani; Petter Gustafsson; [2009]
    Keywords : ;

    Abstract : By the introduction of IMS, future mobile voice traffic will gradually be based on IP. This means that GSM has to undergo further development in order to stay compatible with other mobile networks. Before introducing VoIP into GSM, the impact of the SIP signaling needs to be investigated. READ MORE