Types of modems and codecs

V.92 modem --> US Robotics 
V.91 modem

Bell 103 --> ITU V.21 --> 300 buad rate
Bell 212a --> ITU V.22 --> 1200 buad rate

ITU-T Rec. V.150.1 (01/2003) Modem-over-IP networks

http://what-when-how.com/voip/fax-and-modem-tones-basics-voip/

H.248

PCM

AVP

AMR-WB/AMR

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