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Cisco BTS 10200 Softswitch ISDN Provisioning and Troubleshooting
OL-12436-02
Chapter 1 ISDN Provisioning
Description of Backhaul Set, Group, and Session
Description of Backhaul Set, Group, and Session
The backhaul session parameters used in provisioning are illustrated in
. As shown in the
figure, Call Agent Side A is connected to the media gateway (MGW) using the Group A signaling paths
(Sessions A1 and A2), and is designated as primary. If one of these sessions goes down, the system uses
the other session for signaling between Call Agent Side A and the MGW. There is no need for the
Softswitch to switch over to Call Agent Side B. If the primary Call Agent goes down, then the Cisco
BTS 10200 switches to the secondary Call Agent.
Figure 1-2
Backhaul Set, Group, and Session
52075
IP network
Voice gateway
Cisco AS5300
Gbit Ethernet
Ethernet
Router
Router
Call agent
backhaul port
Call agent
backhaul port
Call agent
backhaul ports
Backhaul set
Group B
Group A
Session A1
Session A2
MGW backhaul port
Sessions B1 and B2
are established on
Group B. They become
active if the Side B Call
Agent takes over from
the Side A Call Agent
due to a switchover.
Router
DNS
Softswitch
Physical link
Group A logical link
Group B logical link
Legend:
Call agent
Side B (secondary)
Call agent
Side A (primary)