[asterisk-dev] app_fax.c :: Channel Hangup => Transmission Error but fax transmitted successfully !

[dimas at dataart.com]

To my knowledge, all Asterisk applications finish with error if channel was hung up. So the app_fax was designed the same way.
This is to abort further dialplan execution.

I believe, remote party has means to signal that fax transmission is finished without hanging up the call. If it does so, app_fax will return success and Asterisk continues executing dialplan.

What you should do is to handle fax transmission result (successful or not) in h extension. This is explained in https://issues.asterisk.org/view.php?id=10815#c73041

Regards,
Dmitry Andrianov



From: asterisk-dev-bounces at lists.digium.com [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Serge Berney
Sent: Tuesday, August 25, 2009 4:20 PM
To: Asterisk Developers Mailing List
Subject: [asterisk-dev] app_fax.c :: Channel Hangup => Transmission Error but fax transmitted successfully !

Hello,

Is it normal that on app_fax.c, when remote party hangup communication (because fax transmission is terminated), that cause a Transmission error ?

Code in app_fax (line 407 & 566) :

inf = ast_read(s->chan);
if (inf == NULL) {
                ast_debug(1, "Channel hangup\n");
                res = -1;
                break;
}

So, when channels hangup, res = -1

And after (line 654) :

if (res) {
ast_log(LOG_WARNING, "Transmission error\n");
                res = -1;
} else if (s->finished < 0) {
                ast_log(LOG_WARNING, "Transmission failed\n");
} else if (s->finished > 0) {
                ast_debug(1, "Transmission finished Ok\n");
}

return res;

Can we detect if communication is hangup after received or during reception to handle error and success ?
So, theres a Transmission error but fax is received well and no other error

See log :


[Aug 25 14:06:59] DEBUG[22144] app_fax.c: Channel hangup
[Aug 25 14:06:59] DEBUG[22144] app_fax.c: Loop finished, res=-1
[Aug 25 14:06:59] DEBUG[22144] app_fax.c: Fax phase E handler. result=0
[Aug 25 14:06:59] DEBUG[22144] app_fax.c: Fax transmitted successfully.
[Aug 25 14:06:59] DEBUG[22144] app_fax.c:   Remote station ID: +xxxxxxxxxxxx
[Aug 25 14:06:59] DEBUG[22144] app_fax.c:   Pages transferred: 2
[Aug 25 14:06:59] DEBUG[22144] app_fax.c:   Image resolution:  8031 x 3850
[Aug 25 14:06:59] DEBUG[22144] app_fax.c:   Transfer Rate:     14400
[Aug 25 14:06:59] WARNING[22144] app_fax.c: Transmission error
[Aug 25 14:06:59] DEBUG[22144] app_macro.c: Spawn extension (macro-rxfax,s,8) exited non-zero on 'SIP/yyyy-081f71c0' in macro 'rxfax'


Sequence : Channel hangup => Loop finished, res=-1 => Fax transmitted successfully => Transmission error !!!

Maybe something goes wrong ?!?! mhmm ?


Serge Berney
Kin SA
Knowledge Integrated Networks
Rue du Bois-du-Lan 8
Case Postale 221
1217 Meyrin 1
Tel: +41 22 989 0 999
Fax: +41 22 989 0 998
s.berney at kinonline.net
www.kinonline.net