I've setup a separate gateway (voipstunt) on my SPA 3000 which I want
to be able to use only when I make a call starting:

00 27

Which would be the call from the UK to South Africa.

I currently use voip.co.uk but want to use voipstun for calls starting
00 27

My dial plan at present is as follows:

(999S0 <:@gw0>|1[45]71S0 <:@gw0>|123S0 <:@gw0>|100S0 <:@gw0>|152S0
<:@gw0>|<:01245>[2-8]xx.|xx.|#9<:@gw0>)


What would it look like if I used the voipstunt gateway (which is GW1)
for calls starting 00 27?