[AsteriskBrasil] tráfego RTP

[Weder Prado]

Olá pessoal,
Coloquei um link de internet dedicado direto no asterisk e registrei
no meu dns externo o ip fixo da máquina, no próprio asterisk apliquei
um firewall iptables, porém no CLI apareceu a seguintes mensagens no
ip de uma conta sip que se registrou:
[Dec  2 21:21:54] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:21:59] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:04] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:09] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:14] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:19] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:24] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted
[Dec  2 21:22:29] ERROR[4105]: rtp.c:2439 ast_rtcp_write_sr: RTCP SR
transmission error to 212.230.220.114:62751, rtcp halted Operation not
permitted

Tenho as seguintes portas liberadas no firewall para entrada e saida:
5060, 1571,5070, 10000 - 20000, 8000 - 8005

No sip.conf coloquei o asterisk para excutar com o endereço 0.0.0.0/0

Alguem sabe se preciso fazer alguma liberação extra no firewall?

No aguardo,
Weder