t38modem 0.8.0+20050304-2build1 (i386 binary) in ubuntu dapper

 From your fax application view point it's a fax modem pool.
 From IP network view point it's a H.323 endpoint with T.38 fax support.
 From your view point it's a gateway between a fax application and IP network.
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 Website: http://www.openh323.org