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The pbx uses a SBC (session Border Controller) to control registrations from outside of its own network. Any IP Phone registering outside the networks requires the Session Border Controller to control each session and make sure the ports on the far end firewall or router are kept open.
IP Phones registered to a straight proxy need to be on a public IP Address. IP Phones connecting out via a local network with NAT involved need to be controlled, otherwise the end user will experience issues such as one-way audio, no connection to the server, servers calling the phone but the call being blocked by the router.
- Controls every session on the pbx
- A requirement when phones are behind NAT
- Added Security
- Included in the license
- Help reduce DOS attacks
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