About: Potential problems with codecs negotiation using SDP protocol

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://vavtest.unob.cz/registr
Description	Modern voice communication networks are usually built as converged networks enabling voice and data transfer upon using an Internet Protocol (IP). Voice services further require a signalling protocol for their work. Nowadays, the Session Initiation Protocol (SIP) is the most popular signalling protocol used in these types of networks. Compared to traditional telephone networks, voice communication over the IP protocol enables a choice of a codec. The codec that will be used to communicate is negotiated by terminals or gateways using the Session Description Protocol (SDP). It is transmitted in the body of the SIP protocol. If respected the rule that each communicating device must support the G.711 codec, it should not lead to a situation where the communicating parties cannot agree on the codec. In practice, the situation is quite different. In many cases, it is not possible to establish voice communications because of unsuccessful negotiation of the codec. The following article briefly presents basic features of the G.729 codec, the SDP according to RFC 4566 and presents one example of unsuccessful codec negotiation obtained in experiments with VoIP equipment, especially equipment used in the ACR. Modern voice communication networks are usually built as converged networks enabling voice and data transfer upon using an Internet Protocol (IP). Voice services further require a signalling protocol for their work. Nowadays, the Session Initiation Protocol (SIP) is the most popular signalling protocol used in these types of networks. Compared to traditional telephone networks, voice communication over the IP protocol enables a choice of a codec. The codec that will be used to communicate is negotiated by terminals or gateways using the Session Description Protocol (SDP). It is transmitted in the body of the SIP protocol. If respected the rule that each communicating device must support the G.711 codec, it should not lead to a situation where the communicating parties cannot agree on the codec. In practice, the situation is quite different. In many cases, it is not possible to establish voice communications because of unsuccessful negotiation of the codec. The following article briefly presents basic features of the G.729 codec, the SDP according to RFC 4566 and presents one example of unsuccessful codec negotiation obtained in experiments with VoIP equipment, especially equipment used in the ACR. (en)
Title	Potential problems with codecs negotiation using SDP protocol Potential problems with codecs negotiation using SDP protocol (en)
skos:prefLabel	Potential problems with codecs negotiation using SDP protocol Potential problems with codecs negotiation using SDP protocol (en)
skos:notation	RIV/60162694:G43__/13:00492667!RIV14-MO0-G43_____
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Vránová, Zuzana Mazálek, Antonín
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ministerstvo obrany / Univerzita obrany - Fakulta vojenských technologií Brno
http://linked.open...dnocenehoVysledku	97842
http://linked.open...ai/riv/idVysledku	RIV/60162694:G43__/13:00492667
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Codec negotiation; RFC 3555; SDP; G.729 (en)
http://linked.open.../riv/klicoveSlovo	Codec negotiation G.729 RFC 3555 SDP
http://linked.open...ontrolniKodProRIV	[8C1FE765BAB5]
http://linked.open...v/mistoKonaniAkce	Brno
http://linked.open...i/riv/mistoVydani	Brno
http://linked.open...i/riv/nazevZdroje	International Conference on Military Technologies 2013, ICMT'13
http://linked.open...in/vavai/riv/obor	KA
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...UplatneniVysledku	2013
http://linked.open...iv/tvurceVysledku	Mazálek, Antonín Vránová, Zuzana
http://linked.open...vavai/riv/typAkce	WRD - Světová
http://linked.open.../riv/zahajeniAkce	2013-01-01 (xsd:date)
number of pages	6 (xsd:int)
http://purl.org/ne...btex#hasPublisher	University of Defence, Brno, 2013
https://schema.org/isbn	978-80-7231-917-6
http://localhost/t...ganizacniJednotka	G43

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