[VoiceOps] TCP Signaling for SIP Signaling

[Nikolay Shopik]

On 17/07/17 12:22, Alex Balashov wrote:
> On Mon, Jul 17, 2017 at 12:19:47PM +0300, Nikolay Shopik wrote:
> 
>> - protect you from async routing of packets (we had issue where we
>> protect TCP stream with VPN tunnel, but at some point something broke
>> at farend side and packets keep flowing around tunnel and UDP gladly
>> accept them since there no session establishing)
> 
> Assuming that firewall rules make this possible, wouldn't this occur
> with TCP as well, by way of the client or server simply opening a new
> TCP connection next time one needs to contact the other?
> 

Our case was with multi homing, TCP won't accept SYN.ACK response on
different interface since its binding to IP when sending SYN.
Unfortunately I don't remember all details now.

So yeah TCP doesn't protect from all async cases but helps in some.