I dont know if this is a bug or limitation. I want a \+44.@ using a Mob Route Filter to match a dialled number of +447917123456, so have a route filter with a tag of Mobile Access and Mobile Subscriber exists (so no National Access i.e. the leading 0).
US Cellular - Baraboo 906 Us Highway 12, Ste 102, Baraboo WI 53913 Phone Number: (608) 356-9380
Baraboo, Wisconsin (10 mi / 17 km) Reedsburg, Wisconsin (13 mi / 20 km) Loganville, Wisconsin (15 mi / 25 km) La Valle, Wisconsin (17 mi / 28 km) Mauston, Wisconsin (18 mi / 29 km)