[Asterisk-Users] Re: Direct SIP connection to Vonage service

[Benjamin on Asterisk Mailing Lists]

On Sun, 24 Oct 2004 01:45:19 +0200, Stewart Nelson <sn at scgroup.com> wrote:
> I looked at NuFone.net and some others, but it appears that
> IAX is not right for my system.

I'd say this is only because you don't know enough about IAX yet ;-)

> I live near Reno, NV, and
> have a second home in Paris.  Most of my calling is to the
> US, via an H.323 gateway to the Reno POTS line;

Install an Asterisk server in Reno and run IAX.

> overflow traffic is sent to an H.323 ITSP.

Replace that with a provider that supports IAX, ie NuFone.

> I run GnuGk on a shared
> server at a hosting provider in New York.

Run Asterisk on that or take it out of the equation entirely.

> Paris has a Cisco
> 827-4V (ADSL modem / NAT / 4 FXS) that speaks H.323 and SIP.

Replace that with an Asterisk server and run IAX.

> There are also some associates on the system using ATA-186.

Replace those with Digium IAXy ATAs or Farfon Farata ATAs.

> When calling from an H.323 or SIP client to an IAX service
> (or vice-versa), I believe that Asterisk must proxy the
> media stream.

No, it doesn't. Only if you force it.

> If * is run at the hosting service, I'm
> worried that delays caused by other users will result in
> choppy voice.  I'd rather run * in Reno, where it could also
> replace an ancient DOS-based voice mail, and possibly my
> Partner key system.  However, that configuration would have
> lots of extra delay.  For example, if the IAX provider is in
> Michigan, a call from Paris to San Francisco would go
> Paris->Reno->Michigan->California.

No. An IAX call from Paris setup through Reno via NuFone would go like this ...

Paris ---IAX---> Michigan ---???---> SF

... and if NuFone have a node in SF, then it would go ...

Paris ---IAX---> SF ---POTS---> Called Party in SF

[Jeremy, can you elaborate please? Do you run an IAX node in California?]

> With SIP, a REINVITE
> would cause it to go Paris->Michigan->California, saving two
> trips across the country.

IAX does a so called IAX Transfer, which is similar in effect to a SIP REINVITE.

rgds
benjk

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