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uk.telecom.voip (UK VOIP) (uk.telecom.voip) Discussion of topics relevant to packet based voice technologies including Voice over IP (VoIP), Fax over IP (FoIP), Voice over Frame Relay (VoFR), Voice over Broadband (VoB) and Voice on the Net (VoN) as well as service providers, hardware and software for use with these technologies. Advertising is not allowed.

VoIP over a VPN



 
 
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  #1  
Old May 21st 06, 04:50 PM posted to uk.telecom.voip
linker3000
external usenet poster
 
Posts: 75
Default VoIP over a VPN

Is anyone here running VoIP traffic across multiple VPNs - specifically
OpenVPN?

Does the VPN's inbuilt compression have any positive or negative effects?

Any gotchas?

Thanks
  #2  
Old May 21st 06, 06:24 PM posted to uk.telecom.voip
PeterW
external usenet poster
 
Posts: 49
Default VoIP over a VPN

linker3000 wrote in
:

Is anyone here running VoIP traffic across multiple VPNs - specifically
OpenVPN?

Does the VPN's inbuilt compression have any positive or negative effects?

Any gotchas?

Thanks


Yes - I have routed IAX2 down an openVPN tunnel (as well as a bespoke
protocol). SIP could be "interesting".

You may have problems with packet routing and have to use DNAT/SNAT (to
route UDP packets incoming to the openVPN server and send them to the
TUN/TAP adapter to get them to the client)

Compression doesn't help and can make the audio poor unless your openVPN
server has a fast processor that can compress very fast.

Peter
  #3  
Old May 21st 06, 08:40 PM posted to uk.telecom.voip
linker3000
external usenet poster
 
Posts: 75
Default VoIP over a VPN

PeterW wrote:
linker3000 wrote in
:

Is anyone here running VoIP traffic across multiple VPNs - specifically
OpenVPN?

Does the VPN's inbuilt compression have any positive or negative effects?

Any gotchas?

Thanks


Yes - I have routed IAX2 down an openVPN tunnel (as well as a bespoke
protocol). SIP could be "interesting".

You may have problems with packet routing and have to use DNAT/SNAT (to
route UDP packets incoming to the openVPN server and send them to the
TUN/TAP adapter to get them to the client)

Compression doesn't help and can make the audio poor unless your openVPN
server has a fast processor that can compress very fast.

Peter


Thanks for the insight.

L3K
  #4  
Old May 22nd 06, 11:59 AM posted to uk.telecom.voip
aap
external usenet poster
 
Posts: 10
Default VoIP over a VPN


"linker3000" wrote in message
...
Is anyone here running VoIP traffic across multiple VPNs - specifically


KPN (old dutch BT) is running VOIP over VPN for security.
No problem.

In general
- VPN is only increasing latency (trough encryption) and latency should be
below 100ms for the best quality.
- VPN is adding compexity trough NAT/NAS, so you have to use STUN servers


 




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