[asterisk-users] New thread - SIP over VPN

[Alex Balashov]

As with many applications using UDP as a transport, most UDP-based 
application-layer VPN schemes (such as OpenVPN) do have some sort of 
rudimentary backward acknowledgment and reliability layers implemented 
on top of UDP.  They're just a lot more lightweight, primitive, and 
generally much faster and less exacting than TCP.

Frank Bulk wrote:

> Resending is not a waste if the re-transmitted packet can arrive within the
> jitter buffer window.  Practically speaking, though, since UDP packets are
> generally not retransmitted (unless it's within some kind of TCP-based
> tunnel), it's a moot point.
> 
> Frank
> 
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Hans Witvliet
> Sent: Saturday, September 26, 2009 6:06 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [asterisk-users] New thread - SIP over VPN
> 
> <snip>
> 
> Re-sending audio packets is waste of resource,
> Better to have an audio-stream with an occasional missing packet, than
> the delay of waiting for re-transmission and re-ordering.
> 
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-- 
Alex Balashov - Principal
Evariste Systems
Web     : http://www.evaristesys.com/
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