Kamailio's worker_sockets does not impact interface name listners

The worker_socket command works if the Interface is using an IP address, but not if the interface name is used.

For example, the following will create four workers for udp:0.0.0.0:5060

#!define INTERFACE 0.0.0.0

children       = 2
socket_workers = 4
listen         = udp:INTERFACE:5060

However if the eth0 is used in place of 0.0.0.0, only two socket workers will be crated:

#!define INTERFACE eth0

children       = 2
socket_workers = 4
listen         = udp:INTERFACE:5060

I've created a contianer to easily identify this. After starting the rpc command core.psx is called and it's output printed.

By default eth0 will be used:

docker run --rm -it --name kamsocket whosgonna/kamsockets

To use a specific address (and 0.0.0.0 is the easiest), pass it as an environmental variable:

docker run --rm -it --name kamsocket -e INTERFACE=0.0.0.0 whosgonna/kamsockets