Asterisk peers

i have 2 devices, behind nat, on in each location and they both show different port numbers. which port number should i normally see? my rtp ports start 10001 and sip is 5060 udp.

130/130 x.x.x.x D N A 5060 OK (60 ms)

113/113 x.x.x.x D N A 56788 OK (440 ms)