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Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Call Agent
Virtual Termination Call Handler
The VTCH software module supports the communication with the Cisco media gateways using MGCP
and SRCP, as well as manage the signalling requirements with the SS7 network. The VTCH is
implemented on the Centralized Processing Server (CPS). The CPS is based on the same control
processor and communication components as the OPM. However, because the CPS’s only requirement
is to provide processing capacity, it does not require the synchronization and timing unit, time slot
switching matrix, or line cards.
The CPS is also a fully redundant system with dual power supplies and fans, and multiple slots for
hot-swappable cards.
Basic Service Handler
The BSH software module provides Intelligent Network (IN) services such as call screening, number
portability features, and basic number transactions such as toll free numbers. The BSH is implemented
on the CPS, and as with the VTCH module, the only requirement of the CPS is to provide processing
capacity, thus not requiring the synchronization and timing unit, time slot switching matrix, or line cards.
The BSH module uses an integrated Service Control Point (SCP) database for the IN services, with the
internal call handling based on the Intelligent Network Application Part Capability Set 1 (INAP-CS1).
The integrated database can be within one BSH module, and thus physically located in a central POP, or
distributed over multiple BSH modules, and thus multiple POPs. The Service Switching Point (SSP)
functionality that queries the SCP database to provide the IN services is implemented in either an OPM
or VTCH module or modules. Each OPM or VTCH module requires an associated BSH module, up to a
maximum of five BSH modules correlated to the same subsystem number.
An external SCP database can used instead of the one integrated in the BSH module(s). For support
through an external SCP, the iMSS call agent uses INAP-CS1 based on ETS 300 374-1, September 1994
(ITU-Q1600). In this case, communication with the external SCP databases is handled by the OPM
modules.
Operation and Maintenance Server
The OMS is a centralized unit that manages the physical and logical configuration of the whole system,
collecting billing data, monitoring traffic measurements and alarms, and providing the interface to the
local operator and to the MultiService Element Manager (MSEM). See Chapter 3, “Solution
Management” for further information.
The OMS is a fully redundant system with master and slave units dually connected over two Ethernet
links, with an additional backup serial line in case of faults on all Ethernet interfaces. The dual Ethernets
allow redundant interfaces to both the other iMSS modules, as well as to operator consoles and the
MSEM.
Protocol Support
The iMSS-4040 and iMSS-4050 use the ISDN User Part - Inter Virtual Switch (ISUP-IVS) proprietary
protocol for interexchange signalling. An exchange is defined to be an iMSS, single or distributed, with
its own dial plan (resident on OMS). The proprietary Intra Module Control Protocol (iMCP) is used for
intraexchange communication between the OPMs and between the OPMs and OMS.
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