Centos 5.1 and silent...:(

I have problem:

On my centos i make port forwarding to asterisk. When the call is coming, phone is ringing but when i pick up the phone there is a silent. In opposite way is the same…

Someones had the same problem ?

some info:

uname -a
Linux 2.6.18-53.el5 #1

lsmod |grep sip
ip_nat_sip 8129 0
ip_conntrack_sip 11313 1 ip_nat_sip
ip_nat 20973 4 ip_nat_sip,ipt_MASQUERADE,ipt_REDIRECT,iptable_nat
ip_conntrack 53025 6 ip_nat_sip,ip_conntrack_sip,ipt_MASQUERADE,xt_state,iptable_nat,ip_nat

cat /usr/src/kernels/2.6.18-53.el5-i686/.config |grep SIP

iptables -t nat -A PREROUTING -p udp --dport 5060 -j DNAT --to
iptables -t nat -A PREROUTING -p udp --dport 5004 -j DNAT --to



You need to open RTP ports too for UDP:

voip-info.org/tiki-index.php … wall+rules