Aug 21 00:09:57 VERBOSE[10906] logger.c:     -- Executing BackGround("SIP/66.54.140.46-007e09c0", "custom/front-greet") in new stack
Aug 21 00:09:57 WARNING[10906] format_wav.c: Unexpected freqency 22050
Aug 21 00:09:57 WARNING[10906] file.c: Unable to open file on /var/lib/asterisk/sounds/custom/front-greet.wav
Aug 21 00:09:57 WARNING[10906] file.c: Unable to open custom/front-greet (format ulaw): No such file or directory
Aug 21 00:09:57 WARNING[10906] pbx.c: ast_streamfile failed on SIP/66.54.140.46-007e09c0 for custom/front-greet