22 feb 2007 kl. 10.05 skrev Gordon Henderson:
On Thu, 22 Feb 2007, Rilawich Ango wrote:
Hi all,
I have read many forums and discussion groups talking about fax
support in asterisk. Some of them conclude that asterisk doesn't
support fax. However, some of them conclude that there is no
relationship between fax and asterisk as asterisk will only pass the
fax signal to the fax machine. I have tried the fax in asterisk
before but failed. Anyone can give me some guideline how to make fax
support with asterisk?
Search the archives for some scripts I posted a few weeks ago.
But, as shipped, asterisk doesn't have native fax support, but it
can be patched in via the spandsp code, giving you 2 new
applications: RxFax and TxFax. You can plumb an incoming answered
call to RxFax and it will decode the incoming fax stream into a
TIFF file which you can then process as required.
Asterisk does have the capability to listen to the incoming line
for the fax startup tones though, so you can use this as part of an
auto-attendant dialplan script to answer the line, listen for fax,
if fax, then call RxFax or connect it to an outgoing analogue port
with a real fax machine on it, or if not, play a message (if you
know the extension, dial it now, etc.).
You really want the incoming stream to be a PSTN line though,
trying to encode an analogue fax call over the interweb is
"problematic" and prone to failure. If going down that route, I'd
get your DID supplier to do the fax to email conversion for you.
(Theres a plethora of them in the UK, don't know about elswhere
though)
And for fax over VOIP, sometimes called FOIP, Asterisk 1.4.x supports
T.38 passthrough. However, the 1.4.0 release
is buggy, so either use 1.4 from subversion or wait for 1.4.1.
/O
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