Trunk is trunk..
We use Direct SIP trunk to service provider as standart on our installations. We might use CUBE need split for trunk recording .
Ask Service provider their settings.
Some points, trunk specific..
-System/Security/sip trunk security profile (TCP or UDP signaling )
-System/region/Audio codec preference list, copy for editable list for correct order ( + system/service parameters/cumc. some codecs too)
-Device/device settings/Sip Profile ( for trunk) . IF allowed, Enable SIP options PING, It is nice option to see if trunk alive...
-Device/trunk ... dependent on operator. Here i put only one iP for trunk, but depends on operator how many IPs they use.