[asterisk-users] iptables miss up phone calls if not used properly

[Gordon Henderson]

On Tue, 13 Apr 2010, khalid touati wrote:

> Hi Guys,
> i wanted to share this with u and ask for little help at the same time:
> i used iptables to secure my server, so i wnet ahead and blocked avery thing
> except a couple of domain protocols and UDP ports of SIP, IAX2 and that
> range 15000 to 20000, tested it and OK. when in production, the calls were
> taking a huge time 7s to be established and somtimes after call setup people
> cannot hear ech other (but not all the time which weird), so iptables can
> miss up performance if not set correctly (even if it's working, stuff like
> this can happen). so if any body have some lines of iptables that secure
> server and don't cause performence trouble to phone calls please share with
> me (i am using Centos 5.3 asterisk 1.4.24).

You've probably blocks too much and it's stopping DNS working properly.

Gordon