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

[khalid touati]

DNS!! i believe it has to do with call setup and rtp protocol cause all
devices shows as sip peers at the call time, but not 100% sure. any iptables
plz :) !

2010/4/13 Gordon Henderson
<gordon+asterisk at drogon.net<gordon%2Basterisk at drogon.net>
>

> 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
>
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-- 
Abdullah
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