We are migrating to a new SIP trunk service and wanted to know the "Best Practice" for doing this in 3CX 15.5? Since you cannot have the same DIDs, which we have a lot, configured in both SIP trunks at the same time and we want to minimize the migration time there seems to be 3 options to do this: 1 - Create the new SIP trunk with a "dummy" main number Export current Inbound Rules Wait until porting is complete Update SIP trunk with correct main number Import Inbound rules 2 - Manually change existing SIP trunk provider with new/updated info to be replacement SIP trunk provider and not have to touch the Inbound rules. Not sure if this will be problematic. 3 - Create new SIP trunk service with "dummy" main number Wait until porting is complete Delete DIDs configured with original SIP trunk Delete Inbound call rules Manually add DIDs to new SIP trunk Manually create new call rules I would think it is pretty common to change SIP providers and wanted to know how this is being handled and any tricks learned. Thanks, Ed.