I need to add a second Ethernet card to a server since the SIP provider has a direct connection to its site. One card would go to the inhouse lan which has a gateway to the internet. Long distance calls would go thru a different provider thru the internet gateway. Locals calls would go thru a analog cards. Inbound calls would go thru the SIP provider with its direct connection. My question is this routing is done with the SIP.conf or in the Linux routing.