[Asterisk-Dev] DID number not saved when incoming fax detected on Zap

[James Armstrong]

I have been fighting a problem with incoming faxes on our DID numbers. I 
need to get the original NDID so I can route the fax to the person's 
email address. The ${FAXEXTEN} is always 's' and I have been trying to 
track down why. It looks like the chan_zap code detects the 'f' for fax 
as the last digit of the incoming DTMF digits and immediately routes the 
call to the fax extension before the ->exten has been set with the 
incoming DID number. Is there a way for this to be fixed? I tried to 
shorten the inter dtmf timer so the DID would come in and timeout before 
the fax tone was detected but it looks like the code is using a 
hardcoded inter digit timeout when faxdetect is enabled. There is a two 
second gap between the last dtmf digit and the 'f' for fax detect in the 
log, then the call is routed to the fax extension from the zt_read 
function, which I think happens before the digit gets back to the 
ast_waitfordigit() function in the ss_thread function which builds the 
incoming extension.

- James