-- Registered extension context 'call-monitor'; registrar: pbx_config
    -- Attempting call on SIP/1234543@povider for s@test:1 (Retry 1)
  == Using SIP RTP CoS mark 5
       > Channel SIP/povider-00000009 was answered
    -- Executing [s@test:1] Answer("SIP/povider-00000009", "") in new stack
    -- Executing [s@test:2] Wait("SIP/povider-00000009", "1") in new stack
    -- Executing [s@test:3] BackGround("SIP/povider-00000009", "end/uni") in new stack
    -- <SIP/povider-00000009> Playing 'end/uni.gsm' (language 'ru')
       > 0x7f519c00b990 -- Probation passed - setting RTP source address to 1.2.3.4:54858
    -- Executing [s@test:4] Busy("SIP/povider-00000009", "3") in new stack
  == Spawn extension (test, s, 4) exited non-zero on 'SIP/povider-00000009'
[May 29 11:41:57] NOTICE[11308]: pbx_spool.c:402 attempt_thread: Call completed to SIP/1234543@povider