[AsteriskBrasil] Erro no MixMonitor

[Fabiano Heringer (BiGuRoOt)]

Ae galera, estou utilizando o mixmonitor pra fazer umas gravacoes, no 
log do asterisk recebo:

    -- Executing MixMonitor("Zap/5-1", 
"20061212-175239--88013565.mp3|b") in new stack
Dec 12 17:52:39 ERROR[23024]: format_mp3.c:303 mp3_rewrite: I Can't 
write MP3 only read them.
Dec 12 17:52:39 WARNING[23024]: file.c:968 ast_writefile: Unable to 
rewrite /var/spool/asterisk/monitor/20061212-175239--88013565.mp3
Dec 12 17:52:39 ERROR[23024]: app_mixmonitor.c:251 
launch_monitor_thread: Cannot open 
/var/spool/asterisk/monitor/20061212-175239--88013565.mp3
    -- Executing Dial("Zap/5-1", "ZAP/G1/88013565||tTfL(178800|||)") in 
new stack

ta parecendo erro de escrita, ele cria o arquivo mas nao consegue 
escreve0-lo...que permissoes devo setar?

Abracos