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Summary:ASTERISK-25171: Early completion of feature code attended transfer results in intermittent one-way audio, "ghost ringing" and robotic sound.
Reporter:Rusty Newton (rnewton)Labels:
Date Opened:2015-06-18 15:25:42Date Closed:2015-06-30 07:09:17
Priority:MajorRegression?Yes
Status:Closed/CompleteComponents:Bridges/bridge_native_rtp Channels/chan_sip/General Resources/res_pjsip
Versions:SVN 13.4.0 Frequency of
Occurrence		Constant
Related
Issues:
Environment:* Asterisk GIT-13-723a9d4 built by rnewton @ newtonr-laptop on a x86_64 running Linux on 2015-05-27 16:13:50 UTC * pjsip 2.3Attachments:( 0) asterisk-25171.pcap
( 1) extensions_25171.txt
( 2) full_25171.txt
( 3) messages_25171.txt
( 4) pjsip_25171.txt
Description:This occurs with chan_sip and chan_pjsip.

Three phones, A, B and C.

[Edit - turns out it doesn't matter what phone is used]

REPRODUCTION:

* A calls B
* A initiates feature code attended transfer and dials C
* While C is ringing, A hangs up. "blonde transfer"
* C answers and is bridged with B.

The result is that B, hears muffled and static-ridden ringing that goes on seemingly forever. Typically B does not receive audio from C, but every few calls B will be able to hear C. The received audio when available will be quite robotic sounding.

The audio from B to C is fine. C can hear B clearly.

Debug to be attached shortly.
Comments:By: Rusty Newton (rnewton) 2015-06-18 16:10:29.790-0500

Attaching configs for reproduction along with messages, full log, pcap from an instance of reproduction.

In this particular case, B or BOB experienced the ghost ringing and no receive audio from C. C could hear B fine.
By: Rusty Newton (rnewton) 2015-06-18 17:14:49.924-0500

Tested with chan_sip as well. Same deal, it occurs with both SIP channel drivers.
By: Rusty Newton (rnewton) 2015-06-18 17:22:07.424-0500

I noticed that in both tests with chan_sip and chan_pjsip that the WriteFormat and WriteTranscode values in 'core show channel' seem odd for the B party. With blind transfers and normal attended transfers it is all ulaw. I only see transcoding come in during the early completion on the attended transfer.

{noformat}
newtonr-laptop*CLI> core show channel SIP/BOB-00000007
<snip>
         State: Up (6)
 NativeFormats: (ulaw)
   WriteFormat: slin
    ReadFormat: ulaw
WriteTranscode: Yes (slin@8000)->(ulaw@8000)
 ReadTranscode: No
Time to Hangup: 0
  Elapsed Time: 0h0m26s
{noformat}

{noformat}
newtonr-laptop*CLI> core show channel SIP/CATHY-00000008
<snip>
         State: Up (6)
 NativeFormats: (ulaw)
   WriteFormat: ulaw
    ReadFormat: ulaw
WriteTranscode: No
 ReadTranscode: No
Time to Hangup: 0
  Elapsed Time: 0h1m31s
{noformat}