Redirect of ControlPlayback causes hangup

Asterisk Asterisk Support
1

I have an app that needs to occasionally bust in on someone listening to a file when an external event happens (like a status event). I redirect callers from voice file to voice file using the Call Manager’s Redirect command. I’m having a problem with ControlPlayback, though.

This callflow works:

  1. Caller calls in
  2. Manager Redirects to play a voice file using Playback
  3. An event happens, so I Redirect back to a Wait
  4. Caller is in the Wait now.

This doesn’t:

  1. Caller calls in
  2. Manager Redirects to play a voice file using ControlPlayback
  3. An event happens, so I Redirect back to a Wait
  4. Caller is hung up on by Asterisk.

I modified app_controlplayback.c to printf the res variable upon leaving, thinking that it was returning -1, which would cause a hangup. But it says it’s returning 0 (I do get CPLAYBACKSTATUS=ERROR, though).

The meat of my extensions.conf:

exten => 1000,1, Answer
exten => 1000,2, Wait(600)
exten => 1000,3, Goto(1000,2)

exten => 1000pb, 1, Playback(${VOICEFILE})
exten => 1000pb, 2, Goto(1000,2)

exten => 1000pbskip, 1, ControlPlayback(${VOICEFILE},5000,6,4)
exten => 1000pbskip, 2, Goto(1000,2)

Any ideas on why ControlPlayback causes a hangup after a Manager Redirect?

2

This are SIP calls, BTW, with autofallthrough=no (or yes, it doesn’t seem to matter) and canreinvite=no, if that means anything.