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PacketStar
®
PSAX 4500 Multiservice Media Gateway User Guide
, Issue 2
Release 8.0.0
Chapter 3 System Features
Connections Support
SVC Functional
Description
SVC signaling, per ATM Forum UNI 3.0 and UNI 3.1, is selectable on a per-
port basis. Call control is performed on the CPU module, including manage-
ment of the call-state transitions for each of the calls. This process allows on-
demand allocation of bandwidth and connection resources. The signaling
protocol supports the following basic functions at the UNI interface:
Call States
Call states exist on both the user side and the network side of the transaction.
Call states define which messages can be accepted by the user or the network
entity, and define how they are expected to react to those messages. As the
user or network entity moves from call state to call state, the call switching
process is accomplished.
In cases where the calling party is the user, and the called party is across the
network, the user-side interface (UNI) at the Multiservice Media Gateway
port presents a UNI to the user. The Multiservice Media Gateway port
receives these user-side messages from the user and—based on resource
availability, route determination, and other network factors—presents a net-
work-side interface (NNI or IISP) to the called party or the network-side
Multiservice Media Gateway port.
Feature
Description
Connection/Call Setup
With this feature, calls originate and are
established.
Connection/Call Request
With this feature, requests of resources for
connections to a certain destination are ful-
filled. The Information Element (IE) field
contains resource information including
PCR, SCR, MBS, and QoS class.
Connection/Call Answer
With this feature, the destination party can
respond to a request with VPI/VCI and
other information related to the connec-
tion/call.
Connection/Call Clearing
With this feature, the information associ-
ated with removing the call/connection
request is provided. This includes: 1) calls
removed because there weren’t enough
resources to meet the call request,
2) connections removed when call discon-
nect requests were received from either
party, and 3) calls removed due to link fail-
ure and other network failures.
Reason for Clearing
With this feature, the clearing party can
indicate the cause for initiating its removal
from a connection/call.
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