Session Border Controllers

1
Session Border Controllers

• Gonzalo.Camarillo_at_ericsson.com

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