[AsteriskBrasil] Erro

[André Jan Smit]

Configurei o Asterisk com  modem MD3200, qdo aciono o zaptel com o 
comando service zaptel start, testo com zttool e ztcfg -vv, inicia 
normalmente, em seguida inicio o asterisk com asterisk -vvv, ai começa 
as seguintes mensagens, como se estivesse alguém ligando.

Asterisk Ready.
Apr 13 21:16:37 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 18 
(Ring Begin)...
Apr 13 21:16:37 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 2 
(Ring/Answered)...
Apr 13 21:16:37 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 18 
(Ring Begin)...
Apr 13 21:16:38 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 2 
(Ring/Answered)...
Apr 13 21:16:38 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 18 
(Ring Begin)...
Apr 13 21:16:38 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 2 
(Ring/Answered)...
Apr 13 21:16:39 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 18 
(Ring Begin)...
Apr 13 21:16:41 NOTICE[2454]: chan_zap.c:6062 ss_thread: Got event 2 
(Ring/Answered)..

Teve vez que nao acontece, ai ligo para o numero o qual conectei ao 
modem e escuto o som que programei no extensions.conf e em seguinda 
desliga.
O que pode estar acontecendo?
Valeu.