[Asterisk-Users] Please help

[Abhishek]

I am facing problem in playing a wav or gsm file on asterisk. The error i
get whenever i tried is

*CLI>     -- Executing BackGround("SIP/1235-98f6",
"/etc/asterisk-1.2.0/sounds/vm-goodbye.gsm") in new stack
Jan 13 20:08:57 WARNING[6181]: file.c:508 ast_openstream_full: File
/etc/asterisk-1.2.0/sounds/vm-goodbye.gsm does not exist in any format
Jan 13 20:08:57 WARNING[6181]: file.c:820 ast_streamfile: Unable to open
/etc/asterisk-1.2.0/sounds/vm-goodbye.gsm (format ulaw): No such file or
directory
Jan 13 20:08:57 WARNING[6181]: pbx.c:5747 pbx_builtin_background:
ast_streamfile failed on SIP/1235-98f6 for
/etc/asterisk-1.2.0/sounds/vm-goodbye.gsm
  == Auto fallthrough, channel 'SIP/1235-98f6' status is 'UNKNOWN'
    -- Saved useragent "ZyXEL P2000W VoIP Wi-Fi Phone" for peer 1235

Can somebody help out