Network Router User Manual

1-3
Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
OL-15421-01
Chapter 1 Integrated Session Border Controller for the Cisco ASR 1000 Series Routers Overview
General Overview
Figure 1-2 on page 1-3 illustrates the unified model.
Figure 1-2 Unified SBC Model
The Integrated Session Border Controller runs under the distributed model and provides the DBE
functionality.
The distributed model offers advantages over the unified model, as follows:
• Scalable to a larger number of sessions.
• Operational advantages, because the SBE can be upgraded or serviced separately from the DBE.
• The distributed model aligns well with typical voice deployments where the SBE can be co-located
with part of the call agent.
• The many-to-many interface offers capability to load share and balance across networks. Operators
have the flexibility to optimize on loading of the SBE or DBE.
Figure 1-3 on page 1-3 illustrates the distributed model.
Figure 1-3 Distributed SBC Model
Domain A Domain B
271026
SBE+DBE
Domain A
271027
DBE
SBE
SBC
Domain B
Standard
H.248
Interface