Decoder for T.38 (Fax over IP)

[Rayne <hjazz6 () ymail com>]

Hi all,
I noticed that "t38" and "t30" can be used as a filter in Wireshark 1.10.5, but I can't seem to find the source code 
for how such packets are decoded. (I can only find t35.c and t35.h in the epan directory).
So my question is can Wireshark actually detect then decode such packets? If so, where can I find the source code for 
it?
Thank you.
Regards,Rayne

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