ftp.bircom.com - /Yealink/T23G/firmware/

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 9/14/2015 10:33 AM      7297960 T23-44.80.0.70.zip
12/18/2015  2:28 PM      7362127 T23-44.80.0.80.zip
 2/15/2016  4:42 PM      7456948 T23-44.80.0.95.rar
  4/3/2017  2:12 PM      7574673 T23-44.81.0.70.zip