[cisco-voip] One-Way Audio

[Kevin Thorngren]

Hi Kevin,

Based on your tests it does sound as though the firewall is not 
blocking the traffic.  As with most one way audio issues this is 
probably should an IP Routing issue.  Basically what you described 
shows that your IP Phone at home can send and receive RTP streams from 
the GW in your office but is not able to have the sent RTP streams 
reach the IP Phone at your office.  I would suspect that the IP Phone 
in your office is on a different subnet than CCM and the GW.  Possibly 
there is a configuration (or lack of) in the FIrewall that is causing 
the inbound traffic for that subnet to be dropped via a rule or because 
it does not know how to route it.

HTH,
Kevin

On Feb 24, 2005, at 6:48 PM, Kevin Hoffer wrote:

> Ok everyone. I have a strange problem. I have one-way audio for some 
> off  net phones.
>  
> I have a phone at my house that has a public IP Address. Then I have a 
> network of phones at my office which are all also on public IP 
> addresses. They do go through a iptables firewall but that as far as I 
> know isn't blocking anything that should be needed.
>  
> Anyways If I call the office the person on that end can not hear me 
> however I can hear them. Now to make this even stranger yet I can make 
> a outgoing phone call out the pri and back in it (call his did number) 
> and he can hear me and I can hear him but if it goes through cm from 
> phone to phone he can't hear me.
>  
> Kevin
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