Communication terminal apparatus and communication method
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United States of America Patent
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Nov 17, 2020
Grant Date -
Jun 2, 2016
app pub date -
Feb 3, 2016
filing date -
Jun 9, 2011
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Abstract
A communication terminal apparatus is provided that includes a negotiator that negotiates a codec used for communication between the communication terminal apparatus and a counterpart terminal at a start of the communication. The negotiator uses an IP multimedia subsystem (IMS) signaling including one of a session description protocol (SDP) offer and an SDP answer. The negotiated codec supports bandwidths of input signals of a plurality of codecs, and changes a bandwidth of an input signal during the communication with the counterpart terminal by changing a frequency range of the input signal. The apparatus also includes a bandwidth determiner that limits the bandwidth and an encoding bit rate of the input signal of the codec during the communication with the counterpart terminal, according to signaling for limiting the bandwidth and the encoding bit rate of the input signal of the codec, the signaling being notified from a network node.
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