[Asterisk-Users] VPN's

[Tim Pushor]

Sounds like its at the firewall. There are various reasons that the 
firewall could be doing this - perhaps like a syymetric RTP / state 
issue  (traffic direction).

One should watch the traffic at each side of either interface (if at all 
possible) too see what piece is 'dropping the ball'.

Tim

Peter Osborne wrote:

>Well, there are no firewalls and here's where it gets weirder, if the remote 
>side originates the call, both ends can hear fine. If the local side 
>originates the call, it's one way sound. Right now the local side place the 
>call and tells the remote side to call back, heh.
>
>Pete
>
>On 15 July 2005 2:55 pm, Francois BERGERET wrote:
>  
>
>>Hi men,
>>
>>You have some IP ports blocked !
>>I use SuperFreeSwan and I encounter no problem with this kind of
>>configuration.
>>Do you have open all ports on your IPsec gateways ?
>>Think to have a look to your IPchains or any kind of firewall you are
>>running in your IPSec gateway.
>>I use shorewall and it is possible to miss some rules or to let pass few
>>ports only for protections between sites.
>>You must describe more your configurations to see what...
>>
>>Good luck !
>>
>>Francois BERGERET,
>>f6hqz-m at hamwlan.net,
>>France.
>>
>>----- Original Message -----
>>From: "Armin Schindler" <armin at melware.de>
>>To: "Peter Osborne" <pete at bookware3000.ca>
>>Cc: <asterisk-users at lists.digium.com>
>>Sent: Friday, July 15, 2005 8:35 PM
>>Subject: Re: [Asterisk-Users] VPN's
>>
>>    
>>
>>>On Fri, 15 Jul 2005, Peter Osborne wrote:
>>>      
>>>
>>>>Hi All,
>>>>
>>>>I'm using Asterisk for my PBX, I have a remote office that is connected
>>>>by a
>>>>VPN link. I am using Openswan on my side and a Linksys box on the remote
>>>>side. I have a Polycom IP300 on the remote side configured with a static
>>>>IP
>>>>address. When I call the phone on the remote side, it rings and
>>>>establishes
>>>>the call fine. The problem I am having is that the remote side can hear
>>>>the
>>>>call find but the local side hears nothing. Because of the VPN there are
>>>>no
>>>>firwalls in the way. Does anyone have some ideas or atleast how I can
>>>>track
>>>>down the problem.
>>>>        
>>>>
>>>I had the same problem with VPN using 'netscreen' (or a similar name)
>>>boxes.
>>>When I switched from SIP to IAX protocol, it worked perfectly.
>>>
>>>I think the SIP voice UDP packets are blocked somehow, but I didn't
>>>investigated it further.
>>>
>>>Armin
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