Subject: Re: [RRG] reachability

From: Bob Hinden <[email-masked]>
Date: Mon, 9 Jun 2008 15:24:22 -0700

Ran,

On Jun 9, 2008, at 8:15 AM, RJ Atkinson wrote:

> Earlier, Brian Carpenter wrote:
> % Is it OK if only 95% of telephones can be called, too?
> Brian,
>
>  My guess is that at present my own telephones can reach
> less than 90% of the total PSTN-connected telephones deployed
> around the globe.
>
>  There are several *countries* worth of telephones that
> simply are not reachable from my telephones, whether for
> policy reasons (e.g. governmental/political policies)
> or because there are no inter-connection agreements
> (equivalent to "peering agreements"), or for other reasons.

Do you have any data to justify the 90% figure?  Given the growth of  
mobile phones, I would think the number is probably closer to 99%.   
The countries without reachable phones probably don't have that many  
phones in total.

For example, there were supposed to be 3.3 billion mobile phones  
toward the end of 2007.  See: http://investing.reuters.co.uk/news/articleinvesting.aspx?type=media&storyID=nL29172095

Ignoring fixed line phones, 10% of 3.3B would be a lot of unreachable  
phones.  I don't think the countries you are thinking about are that  
large even assuming everyone had a phone.

Bob

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