[asterisk-users] Hangup conundrum with RxFAX

[Gordon Henderson]

Heres something that's making me scratch my head... I'm using RxFAX on 
ISDN lines and in-general it's going well.

However, there seems to be a case when the fax doesn't get delivered, but 
looking through the CDRs it seems that the call happened, RxFAX was 
executed .. time passed (1-2+ minutes) then hangup.

I'm wondering if some FAX machines just hangup after the call rather than 
complete some sort of ending negotiation, or if the RxFAX part misses the 
end and just sees the hangup..

Now, in a "normal" fax machine, it's going to print the fax regardless, 
even if the last page is only half full because of a genuine line drop or 
hangup, but it seems that:

[Description]
   RxFAX(filename[|caller][|debug]): Receives a FAX from the channel into the
...
   Returns -1 when the user hangs up.
   Returns 0 otherwise.

So if it's returning -1, then the call/channel is hungup, and any dialplan 
instructions after it won't get executed, even though there might be some 
(or all) pages of the fax sitting in the receive file...

Does this make sense to anyone, or am I barking up the wrong tree!

My thoughts now are to actually do a hangup at the end of the RxFAX and 
rely on a 'h' extension to pick it up and carry on with the 2nd half 
(which is PDFing and emailling the fax), but I'm concerned I'm going to 
lose the channel variables as it suggests on the wiki, so I'll lose the 
REMOTESTATIONID string and caller ID...

Anyone with any experience of this, or suggestions otherwise?

Thanks,

Gordon