Setting source IP on outgoing packets

[vinylmike]

1. Brekeke Product Name and Version:
Brekeke SIP Server, Version 3.4.7.2, Advanced

2. Java version:
1.8.0_92

3. OS type and the version:
Red Hat Enterprise Linux Server release 6.8 (Santiago)

4. UA (phone), gateway or other hardware/software involved:
Voxeo Prophecy

5. Your problem:

Our Brekeke SIP Server has several network interfaces.

How would I tell the server to set a particular source IP for outgoing traffic to some gateways, and a different source IP for other gateways?

i.e. for gateway 1 traffic must come out the proxy with source IP 1.1.1.1 (ie not a private, RFC1918 IP) (while looking at outgoing traffic with tcpdump), and for gateway 2 from Y.Y.Y.Y (again not a private IP).

Tried setting $ifdst to the source IP in the dial plan but tcpdump still showed traffic going out of the internal LAN IP (10.x.x.x) of the proxy.

[taitan]

Use Linux's "route" command.

[Emeryer]