Changed to new outbound SIP server (working), but old server still being contacted

There is nothing I can find in the GUI or in the configuration file, that would make this R201 (v4.4.2) still contact the old SIP server that is no longer configured. 

I have updated the Primary and Backup servers on both the FXS 1 and 2 ports, and enabled both lines, and still, the old server is still being contacted, though I can find no references anywhere in the configuration file.

The SIP is working fine to the new server, but our firewall says that the managed router is still attempting to reach out to the old server. How can we fix this?