[asterisk-bugs] [Asterisk 0013405]: [patch] T38 gateway

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=13405 
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Reported By:                dafe_von_cetin
Assigned To:                
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Project:                    Asterisk
Issue ID:                   13405
Category:                   Applications/app_fax
Reproducibility:            N/A
Severity:                   feature
Priority:                   normal
Status:                     confirmed
Target Version:             1.6.4.0
Asterisk Version:           SVN 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases):  trunk 
SVN Revision (number only!): 140548 
Request Review:              
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Date Submitted:             2008-08-30 16:44 CDT
Last Modified:              2009-07-22 12:09 CDT
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Summary:                    [patch] T38 gateway
Description: 
Hi all,

I'm sending you patch containing new application app_faxgateway.c
("FaxGateway") which is able to mediate T30 to T38 and vice versa.
Feature is using spands library (I used spandsp-0.0.4pre18 and
spandsp-0.0.5pre4).

Best regards
Daniel.

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 (0108086) dimas (reporter) - 2009-07-22 12:09
 https://issues.asterisk.org/view.php?id=13405#c108086 
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1. JFYI, the semantics of T38 related control frames in Asterisk have
changed significantly recently so any code using these needs to be updated
appropriately. Take a look at recent changes to  chan_sip and app_fax to
get in idea.

2. IIRC there was some work on new bridging API for asterisk. There are
different types of bridges available (like one-to-one or one-to-many). To
me it looks like the T38 fax gateway is just a special type of bridge, not
a separate application.

It is just my thought but I'm thinking about the scenario:
1. at some point Asterisk bridges channels A and B
2. Later asterisk receives T38 request on channel A
3. Asterisk determines it can not pass this request to channel B because B
reports it does not support T38 at all.
4. At this point Asterisk decides to temporary replace current A-B channel
bridge with T38 gateway bridge.
5. new bridge does the conversion of T38 to audio (or back)

Well, it may sound weird. Probably it is weird :) But it definitely worth
researching IMHO. This Asterisk will be doing translation transparenyly... 

Issue History 
Date Modified    Username       Field                    Change               
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2009-07-22 12:09 dimas          Note Added: 0108086                          
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