Bind Steward to a specific IP

Is it possible to bind Steward to a specific IP? The question arise after we realised in one deployment where the host with Steward has several IPs from the same network was sending Steward responses from different IP from time to time which was not good from the firewall standpoint. Can it be configured to use a specific outgoing IP or it uses bind() to 0.0.0.0 and firewalls should be configured to expect connections from all available IPs? I suspect the latter but just wanted to re-confirm. Documentation for Steward is quite thin and does not go that deep, unfortunately.