God told Moses to make the silver trumpets for the Tabernacle personally. Does that mean Moses himself or was an agent of Moses ok? IDK. Numbers 10:2

The silver trumpets were sounded differently to signal the people for different purposes.

-Tekiah (long clear blast) from both trumpets is used to summon the whole congregation. Num 10:3
-A single Tekiah (long clear blast) from one trumpet is summons only the leaders of the people. Num 10:4
-Teruah (repeated short blasts) calls to march or to war & was sounded to signal the camps on the east side to move out. Num 10:5
-A 2nd Teruah (repeated short blasts) signals the camps on the south side to begin marching. A 3rd & 4th blast are implied. Num 10:6