Nope, GulfWIN is an ISSI setup linking those systems. Not an RF Patch, not an SmartX Bridge. All the linked systems are Motorola ASTRO-25 , and designed to be easily linked via ISSI pathways. If you ever get to look at the MOUs and other agreements you will see it. Also, look at the TXWARN system for the actual ISSI TGs that are listed on it for GulfWIN. Some of the earliest links were SmartX and MotoBridge etc. But it is all set up now that if the word is given, a few keypresses later, and you have an 6 state P25 TRS essentially.