Cisco ASR 5000 series Product Overview page 861

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Table of Contents

Mobility Management Entity Overview

Management initiation at HSS with trace activation via authentication response messages over S6a reference

Signaling based activation through signaling from subscriber access terminal

The session level trace function consists of trace activation followed by triggers. The time between the two events is

treated much like Lawful Intercept where the EPC network element buffers the trace activation instructions for the

provisioned subscriber in memory using camp-on monitoring. Trace files for active calls are buffered as XML files

using non-volatile memory on the local dual redundant hard drives. The Trace Depth defines the granularity of data to

be traced. Six levels are defined including Maximum, Minimum and Medium with ability to configure additional levels

based on vendor extensions.

All call control activity for active and recorded sessions is sent to an off-line Trace Collection Entity (TCE) using a

standards-based XML format over a FTP or secure FTP (SFTP) connection.

Note: In the current release the IPv4 interfaces are used to provide connectivity to the TCE. Trace activation is based on

IMSI or IMEI and only Maximum Trace Depth is supported in this release.

The following figure shows a high-level overview of the session-trace functionality and deployment scenario:

Figure 204. Session Trace Function and Interfaces

Trace Collection

IP Connectivity

Features and Functionality - Base Software ▀

Cisco ASR 5000 Series Product Overview ▄