Weblogic: Failed to start the sip service, shutting down

After I run config.sh to set up Weblogic admin server and managed server. I was unable to start the managed server from the command line. Here's the error message I got:
Failed to start the sip service, shutting down

Solution: While the admin server, go to the web GUI and remove the manage server from SIP Server
(SipServer > Targets > SIP Server Targets

Now I can start managed server from command line or script!