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Statements

Subject Item
n2:RIV%2F60162694%3AG43__%2F13%3A00492667%21RIV14-MO0-G43_____
rdf:type
n8:Vysledek skos:Concept
rdfs:seeAlso
http://vavtest.unob.cz/registr
dcterms: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.
dcterms:title
Potential problems with codecs negotiation using SDP protocol Potential problems with codecs negotiation using SDP protocol
skos:prefLabel
Potential problems with codecs negotiation using SDP protocol Potential problems with codecs negotiation using SDP protocol
skos:notation
RIV/60162694:G43__/13:00492667!RIV14-MO0-G43_____
n4:aktivita
n6:I
n4:aktivity
I
n4:dodaniDat
n12:2014
n4:domaciTvurceVysledku
n9:6366872 n9:4931645
n4:druhVysledku
n16:D
n4:duvernostUdaju
n21:S
n4:entitaPredkladatele
n20:predkladatel
n4:idSjednocenehoVysledku
97842
n4:idVysledku
RIV/60162694:G43__/13:00492667
n4:jazykVysledku
n10:eng
n4:klicovaSlova
Codec negotiation; RFC 3555; SDP; G.729
n4:klicoveSlovo
n5:G.729 n5:Codec%20negotiation n5:SDP n5:RFC%203555
n4:kontrolniKodProRIV
[8C1FE765BAB5]
n4:mistoKonaniAkce
Brno
n4:mistoVydani
Brno
n4:nazevZdroje
International Conference on Military Technologies 2013, ICMT'13
n4:obor
n15:KA
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
2
n4:rokUplatneniVysledku
n12:2013
n4:tvurceVysledku
Mazálek, Antonín Vránová, Zuzana
n4:typAkce
n14:WRD
n4:zahajeniAkce
2013-01-01+01:00
s:numberOfPages
6
n13:hasPublisher
University of Defence, Brno, 2013
n18:isbn
978-80-7231-917-6
n11:organizacniJednotka
G43