The Cirpack SBC’s Topology Hiding feature protects VoIP networks by reliably hiding internal network details from external parties. The SBC acts as a proxy between the internal and external network and removes or modifies sensitive information in the SIP messages.

For example, internal IP addresses are replaced by the address of the SBC or a public IP. SIP header fields such as Via, Record-Route and Contact, which could allow conclusions to be drawn about the internal structure, are also specifically adapted or removed by the SBC.

If desired, the SBC also takes over the media handling: It forwards media data streams itself and replaces all information on media IPs and ports with its own. This protects not only the signaling, but also the internal media topology.

Through these comprehensive measures, the Cirpack SBC prevents external parties from gaining information about the internal infrastructure – a decisive security advantage for any VoIP network.