I am looking at a pointer to troubleshoot this problem. The VG224 is running IOS version vg224-i6s-mz.124-2.T6.bin and is setup as H323 Gateway.
description CN,DX,E,Connected to xs9521dx001 FastEthernet1/0/44
ip address 10.83.187.4 255.255.255.0
no ip redirects
no ip proxy-arp
no snmp trap link-status
h323-gateway voip interface
h323-gateway voip bind srcaddr 10.83.187.4