Could this be a picture?

Numbers 10:2 Make thee two trumpets of silver; of a whole piece shalt thou make them: that thou mayest use them for the calling of the assembly, and for the journeying of the camps.

 3 And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation.

Is not the blowing of the trumpet for the calling of the assembly?

I Thessalonians 4:16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:

 17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.

There are two trumpets, so could one of them give the last trump?

I Corinthians 15:52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.

Is not all the assembly to assemble at the door?

However, isn't Jesus the door?

John 10:7 Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep.

 9 I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture.