As you may know the chronological to T.37 offramp works in Cisco voice gateway is:
when voice gateway receives email with the iptional TFF attachment, the MSPI (mail service provider interface)
process passs any text and TIFF to the DMSP(document media service provider) process. The DMSP process takes the text and TIFF information and format it into a fax pages. The fax page the passed to the FESP (fax media service provider) process for trasmission to the terminating processes.
So, in the basic term voice gateway would simply convert text and TIFF to fax page then sends out.
If the attached .tif file is the result from the receiver then I could try to use another converter if you can, or
simply create your own tif file then send the fax across. If it was then perhaps there may be a slight difference
in HEX value for .tif that generated by different application.
In regards to T.37 offramp configuration, please take a look with the following link:
There are many ways to convert PDF into TIFF, but the TIFF has to be compatible with Cisco offramp. That means TIFF profile F (black and white with MH/MR or MMR encoding), where image follows TIFF tags; see chapter 6 of "Fax, Modem, and Text for IP Telephony" by Cisco Press for further details.
You can use tiffdump or tiffinfo utilities from LibTIFF http://remotesensing.org/libtiff/ to check if your TIFF files are compliant (watch for tag 273 in particular, this is image offset). Unfortunately some products, including Microsoft Fax (Windows 7 fax and send utility) do not generate compliant files.
You might like to use some third party software to generate compliant tiff files, e.g. facsbridge T37FSP from http://www.sandlerco.com/ is the driver that bridges Microsoft Fax and cisco T.37 gateway. It makes sure the TIFF files are compliant with Cisco offramp.
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