1. Session Border Controllers

2. Definition We do not have a definition
Different SBCs perform different functions
Typically acting as B2BUAs
They are located at the edge of the network
Access
Access control, NAT traversal, …
Peering

3. Peering Topology hiding Traffic monitoring Traffic shaping
Ingress router selection
Load balancing
Protocol repair
Protocol interworking
SIP “profiles”, H.323
IPv6/IPv4 Interworking
Media encryption

4. Technical Problems with SBCs
Do not work with end-to-end confidentiality
Break end-to-end integrity
May make wrong assumptions
Break end-to-end negotiations
draft-camarillo-sipping-sbc-funcs-01.txt