VOIP: ekiga, wengophone, twinkle (was What is 'administrivia')

[Bryan Haskins]

Most Clients for X program just us UPnP these days, so most people are
understandably spoiled by it.

On Jan 2, 2008 12:02 PM, Fergal Daly <fergal at esatclear.ie> wrote:

> On 02/01/2008, Mackenzie Morgan <macoafi at gmail.com> wrote:
> > On Jan 2, 2008 6:23 AM, Fergal Daly <fergal at esatclear.ie> wrote:
> >
> > > If your setup is relatively straight-forward or you are able to open
> > > ports on your firewall then you don't have be SIP expert to get it
> > > working - I know nothing about SIP I got it to work by following the
> > > docs,
> > >
> >
> > I'm going to go ahead and lose all my geek points now.  I don't know how
> to
> > open ports on my router.  I certainly don't expect that any normal user
> > does.
>
> Then I'm not sure how you got any of the other SIP clients to work. As
> I understand it, unless the machine yon which you are running the SIP
> client has a publicly accessible IP address, you will not be able to
> use SIP unless you have a way to twiddle your router.
>
> The problem is that the voice data travels in UDP packets directly
> between you and the other person on the call. If you don't have a
> public IP address - say you are using NAT with a wireless router then
> the packets will arrive at your router and it will not know what to do
> with them - they could be for any of the machines on your wireless
> network.
>
> If you "open the port" (or rather "forward the port") on the router,
> you are telling your router, if any packets arrive on port number XYZ,
> send them to my computer. This will allow SIP to work for you and is
> independent of what SIP client you use.
>
> If one of you has a public IP address and the other a NATted one then
> if the NATted one startes sending the packets first, their router will
> see there is a conversation going on and allow the packets to flow.
>
> If both of you have NATted IP addresses then neither of you can start
> the conversation.
>
> With certain routers, there are tricks you can do to get around this
> but many many routers have no work around.
>
> Skype gets around this by sending your conversation through a 3rd
> computer out on the internet which has a publicly accessible IP
> address. All packets between the 2 chat clients go via this computer.
> So actually there are 2 UDP packet flows, which this 3rd computer
> joins together.
>
> You can also get around this if your router can run a SIP proxy.
>
> I'm curious if you got some other SIP client to work without problems.
> I had the same set of problems with twinkle as with ekiga,
>
> F
>
> >
> > --
> > Mackenzie Morgan
> > Linux User #432169
> > ACM Member #3445683
> > http://ubuntulinuxtipstricks.blogspot.com <-my blog of
> > Ubuntu stuff
> >  apt-get moo
>
> --
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>



-- 
Cheers,
Bryan
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