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Transmitting faxes from Asterisk is somewhat more difficult than receiving them. The reason for this is simply due to the fact that the preparation of the fax prior to transmission involves more work. There isn’t anything particularly complex about fax transmittal, but you will need to make some design decisions about things like:
How to get the source fax file formatted for Asterisk
How to get the source fax file onto the Asterisk system (specifically, into some folder where Asterisk can access it)
What to do with transmitted faxes (save them? delete them? move them somewhere?)
How to handle transmission errors