What Ports Should I Open on My Network?

Ports Setting 

• Port 5060 TCP and UDP for messaging called SIP.

• Ports UDP 16384: 32768 To allow RTP traffic for audio streams.

Other Recommendations for the Network Configuration

1. Contact your ISP to assign a DMZ in order to locate the router or phone, and put your provided gateway into the "Bridge mode." 
2. Connect all VoIP devices and switches over the router.
3. Deactivate: SIP ALG and UPnP (Universal).