Asterisk*CLI>
    -- Executing Dial("SIP/2001-0c44", "SIP/2000|20") in new stack
May 15 19:25:31 NOTICE[3926]: app_dial.c:759 dial_exec: Unable to create channel of type 'SIP'
  == Everyone is busy/congested at this time
    -- Executing VoiceMail("SIP/2001-0c44", "b2000") in new stack
May 15 19:25:31 NOTICE[3926]: channel.c:1724 ast_set_write_format: Unable to find a path from gsm to g729
May 15 19:25:31 WARNING[3926]: file.c:779 ast_streamfile: Unable to open vm-theperson (format g729): No such file or directory
  == Spawn extension (from-sip, 2000, 102) exited non-zero on 'SIP/2001-0c44'
Asterisk*CLI>