As I stated in my response to your PM, the Starr County Sheriff's new P25 trunked radio system is, indeed, supposed to be connected to the Austin controller. I'm actually surprised this system,
WQMI747, is not already up. The controllers are somewhat expensive and have the capacity to run large regional systems. The Austin controller is also connected to the Middle Rio Grande system and the systems in the lower Rio Grande to the west and north of Starr County. Once the Starr County site is reported up and the site number is ID'd it will be added to the site list on the GATRRS DB entry.
TxWARN is another system that is set up this way. The controller in Houston is connected to Parker County west of Fort Worth via a data circuit. This is around 300 miles away.
Russell