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However, intentional gaps in the\u000acase of DTX pauses or radio errors are called for by 3GPP AoIP\u000aspecs and are the default mode for UL RTP Tx in OsmoBTS - therefore,\u000athis philosophical incompatibility between twjit and RTP intentional\u000agaps is likely to be an obstacle to the desired replacement of\u000aBelledonne ortp with twrtp+twjit in OsmoBTS. The greatest practical\u000aeffect of this philosophical mismatch occurs with RTP streams that\u000aapply intentional gaps for DTX: with standard twjit algorithm,\u000aisolated-island comfort noise update packets throughout each DTX\u000apause will be dropped.\u000a\u000aUnderrun extension is an optionally-enabled modification to twjit\u000aalgorithm that solves the problem of isolated-island CN update\u000apackets during DTX pauses - i.e., delivers these packets to the\u000aapplication on the output side of twjit. 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