[asterisk-users] SIP/WiFi handsets?

[Hans Witvliet]

On Thu, 2009-09-24 at 09:56 -0400, jon pounder wrote:
> Dean Collins wrote:
> 
> Earlier in the thread someone made a comment about using gsm since 
> everyone had gsm handsets already.
> 
> Can you explain in detail please ? (what hardware specifically, and how 
> does this actually work ?) My ignorant assumption is something like the 
> end user has a cell phone that actually works with 2 carriers - yours 
> and the "real" carrier.
> 

Your assumption is correct.
We set up our own wireless network on several locations / ships, using
nano-BTS systems. Sites were interconnected via VPN's and satelite
links.
And made a roaming agreement with other GSM-providers.
On location (Withing the reach of our own transmitters) you see our name
as gsm-provider and if you move away several kilometers, yoo switch
automagically to a national provider.

Word of caution, probably only viable for large organisations/companies