[Asterisk-Users] no sound when connected

[Vlok Stone]

On Sat, 2004-04-17 at 14:43, Chris Orme wrote:
> Very much sounds like a firewall issue not allowing voice packets back in 
> to you (for the received audio) or them not finding you somehow.
> 
> Think about how do you connect to the internet.  Perhaps 'it' (whatver
> device it is doing firewalling/NAT) is configurable through its bios or a
> web interface or by telnet or ssh.  Depends what 'it' is, but 'it' is
> likely to be involved in the problem.
> 
> You didn't send info of your configuration as to which protocol IAX/SIP
> you are using and how you are trying to connect so I can't give a
> specific answer on how to help you.  Or I didn't read closely enough.
SIP is the protocol. 
> 
> I guess it might be:
> 
> BT 102 -SIP-> Asterisk on local LAN w/PSTN access/zap cards -SIP??->
> firewall/router -adsl?-> internet -SIP-> Asterisk (2)
yes that's the basic layout. firewall is linux w/ 2 nics iptables are
down. I am able to ping out from the asterisk server. So, it is
forwarding. 
iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

still no sound returns from FWD. 
I'm sure it's the firewall, but can't figure out what's getting denied. 

> 
> But I don't know as you didn't say :-(
> 
> I know Asterisk went through time when things weren't easy with
> Grandstream phones, I don't know what the current state of affairs are
> and I guess it is all great now if it working now via your Zap.
> 
> www.voip-info.org or using google to search the archives of this list
> might also help, especially if you search perhaps for the name of your
> firewall or router and asterisk or something like one way audio?  This is
> what I did when I started.
> 
> Also if you have available other SIP clients to try on your network and
> some patience I'm certain this can be tracked down and sorted out.
> 
> It might even be something as simple as 'nat=yes' 'host=dynamic'. There
> are lots of sample configs on www.voip-info.org as well as those supplied
> by Asterisk to work through.  Slowly change options from the sample config
> and with patience you get the hang of things :-)
I have nat=yes and host=dynamic
> 
> Hope that helps a little.  Just trying to put something back for all those
> that helped me.
Thank You. You're help is very much appreciated. I hope I may also be of
assistance soon to others. 

> Good luck.
> 
> Chris
> 
> On Sat, 17 Apr 2004, Vlok Stone wrote:
> 
> > On Sat, 2004-04-17 at 14:01, Chris Orme wrote:
> > > Hi Vlok,
> > > 
> > > When a call connects is the audio one way ?  Can the remote person hear
> > > you but you can't hear them ?
> > yes. 
> > > 
> > > Which way is the audio or is it silent in both directions ?
> > > The echo test?  Is this FWDs echo test or the one running on your
> > > asterisk box (as that is not outside you LAN is it) ?
> > ouside
> > > 
> > > I'm thinking this could be a NAT or firewall issue ?
> > me too. what would i look for. 
> > > 
> > > Maybe you could give more info or a diagram of the set up you have there
> > > so I can have a think about it?
> > > 
> > 
> > > Chris
> > > 
> > > On Sat, 17 Apr 2004, Vlok Stone wrote:
> > > 
> > > > I'm having a sound issue. I'm using BT100 (102). When I dial the echo
> > > > test ( or anything for that matter) outside of my LAN there's no sound
> > > > when it answers although I hear the ringing tones. Is this an RTP or
> > > > codec issue. When I dial through Zap everything is fine. Thanx.
> > > > 
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