Personally, I run my dial plans pretty tight and give priorities to the main VSPs I use. However, I also use 1*, 2*, 3* etc to force a call through a particular provider. I find this gives me complete control over which VSP I use if I don't want to use the normal rules implemented.
eg. If I normally put a call through Pennytel and they maybe down at the time I will use 2* followed by the number to place the call through the provider that I have linked 2*.
It works very much like using the SPA's gateways however, you can have a lot more than 5 VSPs with Vox and a lot more versatility.
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