Another "exercise" :)
I'm typing a wrong password to call through another Asterisk server (this is not "switched") but statically linked. When I hangup...

Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: PONG   
   Timestamp: 00012ms  SCall: 00001  DCall: 00011 [10.100.100.26:4569]
Tx-Frame Retry[-01] -- OSeqno: 001 ISeqno: 001 Type: IAX     Subclass: ACK    
   Timestamp: 00012ms  SCall: 00011  DCall: 00001 [10.100.100.26:4569]
Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: PONG   
   Timestamp: 00012ms  SCall: 00001  DCall: 00009 [10.100.100.22:4569]
Tx-Frame Retry[-01] -- OSeqno: 001 ISeqno: 001 Type: IAX     Subclass: ACK    
   Timestamp: 00012ms  SCall: 00009  DCall: 00001 [10.100.100.22:4569]
Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: PONG   
   Timestamp: 00012ms  SCall: 00001  DCall: 00015 [10.100.100.18:4569]
Tx-Frame Retry[-01] -- OSeqno: 001 ISeqno: 001 Type: IAX     Subclass: ACK    
   Timestamp: 00012ms  SCall: 00015  DCall: 00001 [10.100.100.18:4569]
    -- Executing Answer("SIP/marco_home-c273", "") in new stack
    -- Executing Authenticate("SIP/marco_home-c273", "9876") in new stack
    -- Playing 'agent-pass' (language 'it')
    -- Playing 'auth-incorrect' (language 'it')
Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 000 Type: IAX     Subclass: POKE
   Timestamp: 00013ms  SCall: 00001  DCall: 00000 [10.10.51.70:4569]
Tx-Frame Retry[000] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: PONG   
   Timestamp: 00013ms  SCall: 00005  DCall: 00001 [10.10.51.70:4569]
Rx-Frame Retry[ No] -- OSeqno: 001 ISeqno: 001 Type: IAX     Subclass: ACK    
   Timestamp: 00013ms  SCall: 00001  DCall: 00005 [10.10.51.70:4569]
  == Spawn extension (md, 7187, 2) exited non-zero on 'SIP/marco_home-c273'
    -- Executing Hangup("SIP/marco_home-c273", "") in new stack
  == Spawn extension (md, h, 1) exited non-zero on 'SIP/marco_home-c273'
Tx-Frame Retry[000] -- OSeqno: 000 ISeqno: 000 Type: IAX     Subclass: NEW    
   Timestamp: 00016ms  SCall: 00006  DCall: 00000 [10.10.24.2:4569]
   VERSION         : 2
   CALLED NUMBER   : TBD
   FORMAT          : 65535
   CAPABILITY      : 65535

Rx-Frame Retry[ No] -- OSeqno: 000 ISeqno: 001 Type: IAX     Subclass: ACCEPT 
   Timestamp: 00004ms  SCall: 00001  DCall: 00006 [10.10.24.2:4569]
   FORMAT          : 65407

    -- Call accepted by 10.10.24.2 (format unknown)