*CLI>     -- Starting simple switch on 'Zap/3-1'
    -- Executing [s@incoming-pots:1] Set("Zap/3-1", "~~EXTEN~~=s") in new stack
    -- Executing [s@incoming-pots:2] NoOp("Zap/3-1", "Incoming call CID="KIEHTREIBER AUD" <4083787798>") in new stack
    -- Executing [s@incoming-pots:3] Set("Zap/3-1", "__TRANSFER_CONTEXT=local-functions") in new stack
    -- Executing [s@incoming-pots:4] Answer("Zap/3-1", "") in new stack
    -- Executing [s@incoming-pots:5] Set("Zap/3-1", "LASTCALLER=4083787798|g") in new stack
[Oct 19 14:16:47] WARNING[25862]: pbx.c:5910 pbx_builtin_setvar: The use of the 'g' flag is deprecated.  Please use Set(GLOBAL(foo)=bar) instead
  == Setting global variable 'LASTCALLER' to '4083787798'
    -- Executing [s@incoming-pots:6] GotoIf("Zap/3-1", "1?7:9") in new stack
    -- Goto (incoming-pots,s,7)
    -- Executing [s@incoming-pots:7] NoOp("Zap/3-1", "quiet mode") in new stack
    -- Executing [s@incoming-pots:8] Macro("Zap/3-1", "voicemail") in new stack
    -- Executing [s@macro-voicemail:1] Wait("Zap/3-1", "0.5") in new stack
    -- Executing [s@macro-voicemail:2] Playback("Zap/3-1", "sorry2") in new stack
    -- <Zap/3-1> Playing 'sorry2' (language 'en')
    -- Executing [s@macro-voicemail:3] VoiceMail("Zap/3-1", "main@vm-cynics") in new stack
    -- <Zap/3-1> Playing 'vm-intro' (language 'en')
    -- <Zap/3-1> Playing 'beep' (language 'en')
    -- Recording the message
    -- x=0, open writing:  /var/spool/asterisk/voicemail/vm-cynics/main/tmp/cXaZIA format: wav, 0x81e8600
    -- x=1, open writing:  /var/spool/asterisk/voicemail/vm-cynics/main/tmp/cXaZIA format: gsm, 0x81e7bf8
    -- Recording automatically stopped after a silence of 5 seconds
    -- <Zap/3-1> Playing 'auth-thankyou' (language 'en')
[Oct 19 14:18:34] WARNING[25849]: app_voicemail.c:1710 mm_log: IMAP Warning: Unexpected tagged response: 00000ff7 OK [APPENDUID 1218413773 90] Completed

 !!! Note: the line is still busy (not hung up). We appear to be waiting for something.
 !!! See the first traceback set in asterisk-4.gdb.

*CLI> 
*CLI> [Oct 19 14:19:47] ERROR[25862]: app_voicemail.c:1773 mm_fatal: IMAP access FATAL error: Unlock when not locked

 !!! I just hit return in the asterisk console, and almost immediately got the abort.
 !!! No idea whether that's causative or just coincidence.
 !!! See second set of tracebacks in asterisk-4.gdb.