[asterisk-bugs] [Asterisk 0013034]: 183 response although progressinband=never

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13034 
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Reported By:                klaus3000
Assigned To:                
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Project:                    Asterisk
Issue ID:                   13034
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.21 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2008-07-09 07:03 CDT
Last Modified:              2009-02-23 04:35 CST
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Summary:                    183 response although progressinband=never
Description: 
Hi!

Scenario with Asterisk 1.4.21.1:

SIP Client ----> chan_sip:Dial(zap):chan_zap ---> ISDN

very simple dialplan:
[fromklaus]
exten => _1X.,1,NoOp(1... SIP: Outgoing Call: Asterisk->HiCom)
exten => _1X.,n,Dial(Zap/g1/${EXTEN:1})

Immediately after sending the SETUP message, Asterisk responds with 183
Session Progress. Thus, the SIP client is waiting for inband audio, but
there is no inband audio available. progressinband=never

sip.conf:

[klaus]
type=peer
username=klaus
host=dynamic
context=fromklaus
canreinvite=no
progressinband=never


actually I tried all progressinband settings without any difference
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---------------------------------------------------------------------- 
 (0100526) klaus3000 (reporter) - 2009-02-23 04:35
 http://bugs.digium.com/view.php?id=13034#c100526 
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Hi! I made 2 traces to analyze the current bahavior (1.4.23). I added some
debug messages in app_dial (wait for answer, staring with "Klaus") to see
what control frames are received from the outgoing channel.

The intersting thing is: The 183 from the SIP channel is sent immediately
without receiving any control frame from the outgoing channel. This looks
like a bug in chan_sip.

Further I try to understand what triggers early media inside of Asterisk -
is it AST_CONTROL_PROGRESS? If yes, then the ALERTING with Progress
Indicator "inband available" should generate AST_CONTROL_PROGRESS too (see
trace 1).

1st trace:
> SETUP
< CALL PROCEEDING w/o PI
< ALERTING w/ PI

2nd trace:
> SETUP
< CALL PROCEEDING w PI
< ALERTING w/o PI

3rd trace:
> SETUP
< ALERTING w/o PI 

Issue History 
Date Modified    Username       Field                    Change               
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2009-02-23 04:35 klaus3000      Note Added: 0100526                          
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