Topology hiding manages the source, destination, and routing information in SIP and SDP message headers that must be substituted or changed to maintain the network integrity. Topology hiding also hides the topology of the enterprise network from external networks.

The default Replace Action is Auto. This replaces local information with IP addresses, generally the next hop for destination headers and local IP for source headers.

Topology hiding has an advantage of presenting single and multiple Record-Route headers externally from Session Manager. Topology hiding cannot be applied to the Contact header, but IP addresses are translated to the Avaya SBCE external addresses using NAT.