Hi Simon,

If you have a sip gateway connected to multiple carriers you could use trunks 
or trunk groups to determine which carrier is used for a particular call 
destination. This makes sense when you want certain call destinations to be 
reached only via a certain carries (even though multiple carries could be able 
to transport the call to the call destination network).  Also if a carrier 
gives you better rates to destinations you could force your sip proxy to use a 
trunk with said carrier for only those destinations.  You can also have a sip 
trunk between say two soft switches meaning that all calls that have to 
traverse will be carried via the sip trunk (limitation of concurrent calls 
mostly only depends on available bandwidth and/or processing power of the 
softswitches). VoIP by itself is just the suit of protocols and technologies to 
transport voice packets over a IP network. 

Regards

--
Markus












On Feb 24, 2010, at 4:53 PM, Simon Tusubira wrote:

> What's the difference SIP Trunking and VoIP ?
> 
> On Wed, Feb 24, 2010 at 4:28 PM, Okello Baldwin <[email protected]> 
> wrote:
> LUGists,
>  
> Does anyone know where i can buy a SIP phone in Kampala?
>  
> Thanx
> Baldwin
> 
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