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2-4
Cisco Internet OSS for VoIP: Infrastructure Manager Implementation Guide
OL-2706-01
Chapter 2 Provisioning
Solution Architecture
Figure 2-1 MGCP Packet Voice Network
Figure 2-2 depicts an H.323-based network for Voice Infrastructure and Applications (VIA) Solution.
Similar to the MGCP network, gateways are at the edge of the network, with routers between them
providing for the bearer fabric that shuffles the payload back and forth. In H.323, unlike in MGCP, call
intelligence and the ability to process signaling does reside in the H.323 gateways. Intelligence is,
therefore, much more distributed, compared with MGCP-based networks. However, call processing is
still distributed between gateways and gatekeepers. Gatekeepers are able to make call-level routing
decisions based on dial plans.
In addition, gatekeeper hierarchies can be deployed, reflecting dial-plan hierarchies, with directory
gatekeepers on top of gatekeepers. Likewise, gatekeepers can be supported by route servers in their
decisions. If required, SS7 capabilities are provided through signaling converters that mediate and back
haul the signaling information between the gateway and the SS7 Signal Transfer Point.
Figure 2-2 H.323 Based Packet Voice Network
IP
network
SS7
network
IP, PNNI, ...
Bearer
Signaling and control
VoP network
MGC
Media Gateway Controller (MGC)
Media
Gateway
CPE
84405
V
STP STP
V
V
Media
Gateway
PBX
Circuit
Core/TDM
Class 4
PBX
Call control
MGCP, H. 248,
Megaco, SCTP,
signaling
backhaul,....
Ingress
ITSP
Ingress/Egress
SS7 TDM
carrier
Egress
ITSP
Egress
ASP
Egress
TDM
carrier
84408
V
GK
VV
GK GK
GK
GK
STP
V
V
V
GK
Prompts RADIUS
Ingress DGK
Egress DGK
Ingress DGK
Egress DGK