RSVP-Based CAC on Cisco UBEs
Because a Cisco UBE router is a Cisco IOS gateway, it additionally supports RSVP-based CAC.
Two Cisco Unified Communications Manager clusters can interconnect application Cisco UBE,
thus enabling intercluster RSVP-based CAC. RSVP supports both articulation and video calls.
Figure 9-6 Codec Filtering on Cisco UBEs
RSVP requires at atomic two RSVP peers, so two Cisco UBE Gateways are appropriate to
enable RSVP-based CAC. When deploying Cisco UBE and RSVP-based CAC, ensure that
the flows that should advance RSVP are configured for media flow-through. Media flowaround
is not accurate with RSVP-based CAC.
Figure 9-7 shows a alarm bureaucracy accumulated with RSVP-based CAC example.
Following is the alarm flow:
1. The Cisco Unified Communications Manager Cluster 1 sends an H.225 bureaucracy to the
Cisco UBE router.
2. Cisco UBE processes the alarm bureaucracy advice and assembly an outbound VoIP
dial associate acute an RSVP reservation. Cisco UBE sends out an RSVP appeal to
the alien Cisco UBE router.
3. The alien Cisco UBE acknowledges the catch and initiates the catch for
the acknowledgment path, which is accustomed by the bounded Cisco UBE router.
4. The H.225 bureaucracy bulletin is baffled to the alien Cisco UBE router, which then
routes the alarm to the outbound VoIP punch associate pointing to Cisco Unified
Communications Manager Cluster 2.
5. H.245 agreement occurs with media flow-through enabled.
6. The alarm is established.
Chapter 9: Establishing a Connection with an Internet Telephony Service Provider 531
Cisco UBE
VoIP 1 VoIP 2
1. G.711a-law
2. G.729a
3. G.729b
1. G.711a-law
2. G.729a
3. G.729b
1. G.729a
Cisco UBE Codec Negotiation:
V
Cisco UBE
VoIP 1 VoIP 2
1. G.711a-law
2. G.729a
3. G.729b
1. G.711a-law
2. G.729a
3. G.729b
Cisco UBE with codec transparency:
Transparent
V
Authorized Self-Study Guide: Cisco Articulation over IP (CVOICE)
IP WAN
Cisco Unified
Communications Manager
Cluster 1
Cisco UBE
RSVP Reservation
RSVP Reservation
Cisco UBE
Cisco Unified
Communications Manager
Cluster 2
V V
H.225 Setup
H.245 Setup
1
2
H.225 Setup
H.245 Setup
H.225 Setup
3
4
H.245 Bureaucracy with
Media Flow-Through
5
Call Established
Figure 9-7 RSVP-Based CAC on Cisco UBEs