[Freeswitch-users] nta_agent: tport: Bad message

I connected a Grandstream GXP-2000 to my network, and pointing it to my Freeswitch. Now I get the following message every 15 second: nta_agent: tport: Bad message Using Wireshark, I see it is a UDP message on port 5060 (see below). Is this normal, and should I just ignore it? The phone works fine with Freeswitch. 0000 00 16 cb a5 20 3f 00 0b 82 06 96 d1 08 00 45 a0 .... ?.. ......E. 0010 00 20 02 0b 00 00 fa 11 9d 6c c0 a8 cf 98 c0 a8 . ...... .l...... 0020 cf cb 13 c4 13 c4 00 0c b7 98 00 00 00 00 00 00 ........ ........ 0030 00 00 00 00 00 00 00 00 00 00 00 00 ........ ....