[VoIP] I am now online!

[Steph Kerman]

Thanks Shane.
Steph

Shane Young wrote:
> If it's un-registered, it can't receive calls from the device that  
> requires it's registration.
>
> Even a stationary phone, conencted to a DSL service, could have it's  
> outside IP address change if the DSL provider decided to change it  
> dynamically.  This would cause any inbound calls to fail, because they  
> were trying to reach the phone at the "old" ip address.
>
> Most SIP proxies which think the registering device is behind NAT will  
> tell the device to register quite frequently (every 30 to 60 seconds,  
> from what I've seen).
>
> Steph, if the root of your question is: "How wi-fi phones can work  
> reliably when one walks within range of some random wi-fi hotspot.."
>
> The short answer is: They can't work reliably when one walks within  
> range of some random wi-fi hotspot.
>
> Many hotspots require some web-based authentication anyway, so it  
> really can get more complicated.
>
> Assuming that all hotspots were open and the phone could associate  
> itself with that wireless SSID and get an IP address, it would need to  
> re-register everytime it noticed just about any change.
>
>
>
>
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