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How does a classical extension choose a trunk?

I understand that the classical extension feature would allow me to have IPTEL PBX dial a normal PSTN line when a particular extension is dialed.

However I still don´t understand how is determined the trunk that will be used to dial.

It is determined by your outbound routing rules. So if you set up a rule to route all numbers to UK (say 0044....) via a particular trunk, and you specifiy the external phone number for the classic extension as 0044xxxxxxx then it will match the outbound routing rules for the trunk you send UK calls to.

DAK