IS-641
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TIA/EIA standard IS-641 is a speech coding standard released in 1996<ref name=":0">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and used in some computer and telecommunications networks in the United States. The main usage was in the U.S. TDMA networks defined by IS-136.<ref>Template:Cite tech report</ref><ref>Template:Cite book</ref> The bit rate of the speech codec is 7.4 kbit/s.<ref name=":0" /> This codec is the same as the 7.4 kbit/s mode in the AMR speech codec.Template:Citation needed The standard was supersededTemplate:Citation needed by TIA/EIA-136-410's release in 1999.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>