[Freeswitch-users] How to register sip phone in VOIP Disabled Areas

[Alex Balashov]

On 12/24/2013 01:06 PM, Privus 007 wrote:

> Besides changing to a non standard port (ie. not using 5060), you could
> also try to use TLS transport instead of UDP. If signaling traffic is
> encrypted, it has a better chance of punching through any firewall.

That depends on how it's being blocked.  If it's being blocked crudely, 
on a port level, then they'll just block SIP-TLS (5061) too.  If it's 
being blocked by DPI that identifies the packets as SIP, then switching 
the utilised ports won't work, and, in fact, encryption and/or tunneling 
is the only way around it at all.

-- 
Alex Balashov - Principal
Evariste Systems LLC
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