[asterisk-bugs] [Asterisk 0009650]: No ringing heard on unattanded transfer

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
====================================================================== 
http://bugs.digium.com/view.php?id=9650 
====================================================================== 
Reported By:                rickead2000
Assigned To:                file
====================================================================== 
Project:                    Asterisk
Issue ID:                   9650
Category:                   Core/General
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.4 
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        No 
Request Review:              
====================================================================== 
Date Submitted:             05-02-2007 07:13 CDT
Last Modified:              11-19-2007 19:30 CST
====================================================================== 
Summary:                    No ringing heard on unattanded transfer
Description: 
When performing an unattended transfer, the caller hears silence whilst the
transferee's phone is ringing.  I believe the caller should hear ringing.

This issue is present in 1.4.4
====================================================================== 

---------------------------------------------------------------------- 
 nic_bellamy - 11-19-07 19:30  
---------------------------------------------------------------------- 
I can reliably reproduce this (disclaimer: this was on 1.2.24; I don't have
a 1.4.x box around right now - but I suspect it's the same root cause).

Pre-requisites: SIP phone that will allow you to complete an attended
transfer while the destination is still ringing (I'm using Polycom
phones).

1. A calls B
2. B answers
3. B starts attended transfer to C, and A starts hearing MOH
4. B hears ringing, completes transfer - A stops hearing MOH, getting dead
silence instead, until...
5. C eventually answers phone or call goes to voicemail, at which point A
gets audio again

This happens whether A is a SIP phone or a call coming from a PRI.

What seems to be happening is that answered channel A ends up being
connected to unanswered channel C - but the ringing indication from C has
already been consumed by B, so A never gets it.

What I suspect needs to be happen is that when the channel is masqueraded,
an indication of C's current state needs to be queued to A's channel (ie.
ast_queue_control(..., AST_CONTROL_RINGING) or whatever is appropriate at
the time)

Plausible? 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
11-19-07 19:30  nic_bellamy    Note Added: 0074023                          
======================================================================