[AusNOG] Remote Work - (SIP/Security/CGNAT)

[Peter Fern]

On 11/13/2015 09:59, Luke Iggleden wrote:
> - Get around CGNat RTP Audio/SIP transport issues
> - Ensure SIP server is not open to the world due to dynamic IP's
> connecting
> - Keep the bandwidth requirements to a minimum - Assume low speed DSL
> (2M/512k)

Run a VPN client on the SIP endpoint (on a hardphone preferably, so you
can control it, otherwise on the softphone OS) back to the SIP server,
or nearby terminating device.  This solves the RTP and security issues. 
Use G.729a to reduce network bandwidth.  At 450ms latency though,
conversation quality is going to suck somewhat, no way around that.