On Friday 26 Dec 2014 02:49:37 Bill Kenworthy wrote:
> On 26/12/14 01:42, Joseph wrote:
> > On 12/25/14 16:43, Bill Kenworthy wrote:
> >> On 25/12/14 15:43, Joseph wrote:
> >>> I've installed "zoiper" (this is an softphone app to connect to my
> >>> Asterisk server) on my old phone and it works on my private network
> >>> over wifi.
> >>> I'm using standard IAX port 4569 to register, so this port is open on
> >>> my firewall.
> >>> 
> >>> But when I catch an open public wifi network in a Mall or a Tim Horton
> >>> "zoiper" failed to register.
> >>> 
> >>> Do they block outgoing ports of public WiFi networks? What are my
> >>> alternatives?
> >>> 
> >>> I can open any port on my DD-Wrt and redirect it to my Asterisk server.
> >> 
> >> Quite often happens in this part of the world.  I run an openvpn ssl vpn
> >> on port 443 with an ssl multiplexor on the server end - route all the
> >> voip traffic through the vpn.  Doesnt work well if bandwidth is really
> >> constrained but its the difference between having at least something or
> >> nothing at all.
> >> 
> >> BillK
> > 
> > I do run VoIP over vpn but that is between two points on cable
> > connection and it works very well. But running vpn over wifi plus VoIP
> > will not work very well if at all. Voice will be very choppy.
> 
> Not necessarily - it depends on bandwidth at both ends (my server is on
> adsl.) The important point is port 443 and ssl for the VPN which gets
> past all blocking I have encountered so far though I have not noticed
> deep packet inspection using MITM yet. I am using self signed certs so
> it should show up if its attempted.
> 
> What I have encountered is excessive latency on some open WIFI networks
> that makes voice conversation unpleasant.

Do you use QoS at both ends? It could make a difference with ADSL.

-- 
Regards,
Mick