[Asterisk-Users] Can't hear the caller

[Rich Adamson]

> I've got a strange issue, that I haven't found addressed on the wiki.
> 
> My asterisk box is behind a firewall which routes udp/tcp requests on 5060 and 
> 8000 to asterisk.
> 
> When I make a call from a Zap or SIP extension on the inside of the firewall 
> to any Zap or SIP extension on the inside of the firewall, everything works 
> find.  I have access to voipjet, and when I place a call through them 
> everything also works fine.
> 
> However, I have several SIP extensions defined for remote users.  They can 
> authenticate to asterisk and they can call me and I can call them.  However, 
> whether I place the call or receive the call I cannot hear the remote user!! 
> They can hear me, though. (I'm inside the firewall).
> 
> My remote users are on XLite, if that makes a difference.
> 
> Anybody got an idea why the firewall is blocking traffic for these SIP phones, 
> but not for voipjet?

>From the xlite pdf, it looks like you need udp ports 8000 through about
8006 open on firewall. It says "Two additional ports after 8001 are required
for each additional line used." Might try that.