Hi Rakesh,

 Looking at section D.2.3.1 of the ITU_T T.38 standard, I have the impression that at least the T38Error correction is necessary when udptl as transport is used, because it is _not_ marked as optional...

quote:
UDPTL Options
Maximum Buffer Size
 Att-field=T38FaxMaxBuffer
 Att-value = 1*(DIGIT)
 ;optional
Maximum Datagram Size
 Att-field=T38FaxMaxDatagram
 Att-value = 1*(DIGIT)
 ;optional
Error Correction
 Att-field=T38FaxUdpEC
 Att-value = t38UDPFEC | t38UDPRedundancy

T38VendorInfo
 Att-field=T38VendorInfo
 Att-value = t35country-code SP t35extention SP manufacturer-code
 t35country-code = 1*(DIGIT)
 t35extension = 1*(DIGIT)
 manufacturer-code = 1*(DIGIT)
 ;optional
 ;0 to 255 for t35country-code and t35extension
 ;t35country-code is defined in T.35 Annex A.
 ;t35extension is defined in T.35 Annex B
 ;The value of "manufacturer-code" is assigned nationally
unquote

 kind regards,
Jan


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