Mont. Code Ann. § 40-5-1017

A tribunal of this state exercising personal jurisdiction over a nonresident in a proceeding under this part, under the law of this state relating to a support order, or recognizing a foreign support order may receive evidence from outside this state pursuant to 40-5-1036, communicate with a tribunal outside this state pursuant to 40-5-1037, and obtain discovery through a tribunal outside this state pursuant to 40-5-1038. In all other respects, 40-5-1021 through 40-5-1039, 40-5-1042, 40-5-1043, 40-5-1046 through 40-5-1052, and 40-5-1055 through 40-5-1070 do not apply and the tribunal shall apply the procedural and substantive law of this state.