Why is E61i SIP client pinging strange IPs?

I reflashed my E61i (using NOKIA's software updater). Then installed Trend Micro's Web Security and set the firewall to high (disallowing outgoing packets except those specifically allowed eg http)
Wait a day. Check firewall logs and they're clean.
Install Handy Clock.
Wait another day, check firewall logs and they're clean.
Change firewall settings to allow SIP client to connect to SIP provider only. Setup SIP client for my VOIP provider.
E61i starts pinging IPs in china, spain, argentina, India, UK, Comcast etc at random intervals, sometimes as short as 2 minutes. Some of the IPs appear to be ADSL IPs.
Anyone has any explanation why NOKIA's SIP client should be pinging all these IPs? Is there a vulnerability in the SIP client?
Can anyone recommend a firewall which can tell you which process or application is trying to connect to the internet?
Don

Please find :
C:\>ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
Wireless LAN adapter Wireless Network Connection:
   Connection-specific DNS Suffix  . : srhouse.com
   IPv4 Address. . . . . . . . . . . : 172.21.155.24
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 172.21.155.1
C:\>

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