Managing the PSTN Transformation: A Blueprint for a Successful Migration to IP-Based Networks, 1st Edition (Hardback) book cover

Managing the PSTN Transformation

A Blueprint for a Successful Migration to IP-Based Networks, 1st Edition

By Sandra Dornheim

CRC Press

235 pages | 77 B/W Illus.

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pub: 2015-01-15
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While there are many scholarly books and papers that cover the technical issues behind the public switched telephone network (PSTN) migration, few books describe exactly how to manage the migration process economically. Filling this need, Managing the PSTN Transformation: A Blueprint for a Successful Migration to IP-Based Networks reflects the latest understanding of the challenges behind migrating customers from the old PSTN network to an IP infrastructure.

The IP transformation blueprint described in this book is not a theoretical cookbook that describes how this could work. Instead, the book presents a blueprint that is the product of countless hours of work by hundreds of individuals at Deutsche Telekom (DT) over almost two years.

The book presents insights gained as the DT team migrated the entire public switched telephone network in Macedonia to an Internet protocol-based platform. It illustrates the various types of challenges the team faced in integrating complex systems, including flight control at their airports, alarms for fire and police response, and large enterprise customers.

Detailing new conceptual approaches and the best practices developed for ensuring knowledge transfer within the DT group, the book presents the information in a step-by-step manner to enable you to easily adapt the blueprint for particular service provider requirements. Since successful migration relies on key aspects beyond the technological side, this work provides you with a product portfolio roadmap, migration plan, IT roadmap, business case framework, and a go-to-market plan.

Although the book discusses the experiences of the Deutsche Telekom team as they worked to migrate the telephone network in Macedonia to an Internet protocol-based platform, the IP transformation blueprint and lessons learned presented can easily be scaled up and applied to any market around the world.

Table of Contents

Overarching Topics

The PSTN Migration Process and Interdependencies

Project Structure Organization

Project Structure, Roles, and Responsibilities


Environmental Status Quo

External Factors

Internal Factors

Scenario Analysis

Interim Solutions

Full Migration

Combined Approach (on Area Level)

Standard Mandatory and Optional KPIs

Risk Analysis

Project Internal Risks

Deutsche Telekom AG/NatCo Risks (Micro Environment) 17

Eco System Risks (Macro Environment)

End-to-End (E2E) Process

Adjustment in E2E Processes

Processes without Major Changes

Processes with Incremental Changes

New Processes

Complete E2E Process for PSTN Migration

Migration Plan

Product Development Sequencing

Sequencing Framework for Product Development

Prioritization Criteria and Rationale for Niche Products

Migration Strategy (Including Phases and Types)

Assess Migration Phases

Migration Phases—Timing Guidelines and Key Learning

Assess Migration Types

List of Migration Types

Define the Migration Strategy per Segment/Product and Derive the Related Costs

Framework Migration Strategy for Each Segment/Product Including Unit Cost per Migration by Segment/Product

Migration Strategy per NatCo

Migration Sequencing—Product Sequencing

Prioritization Logic for Product Sequencing

Prioritization Logic with Criteria and Rationale for Niche Products

Migration Sequencing—Area Sequencing

Area Evaluation

Area Sequencing Approach

Product Portfolio Roadmap

Information Collection

A Collection List of the Complete Current Features/Product Catalogue/Terminal Equipment

IP Migration of ISDN—ISDN Features Missing in IMS

Preparation of a Regulatory Checklist

List of Regulatory-Required Features

List of Further Regulatory Requirements and Impacts

Identification of Technically Available Features

Matching of Current Features to Available IP Features

Framework for Matching Features and Drawing Conclusions about Features

Analysis and Selection of Features

Identification of Feature Benefits

Evaluation Approach for Feature Benefits

Calculation of Costs/Resources for Features in Discussion

Evaluation of Features

Evaluation Framework for the Selection of Features

Retirement of Features

Product Definition

Feature Mapping to the Existing Portfolio

Substitute Product Definition

Factors Impacting Decisions on the Product Portfolio Definition

Announcement to NRA and Changing of T&C and Submission of RO

Checklist for Potential Regulator Approval and Best Practices on T&C

Realization of the New Portfolio

Prioritization of Development and Launch Sequence

Planning of Launch and Execution

Commercial Opportunities in B2B and B2C during and after Migration

NT/ IT Roadmap

Target Architecture and Technical Product Development

Target Architecture

Collection and Comparison of Network Strategy Documents

Technical Product Development—Information Preparation

End-to-End Technical Solution for Basic Voice Service

Preparing a List of Available Technical IP-Based Features

Identification of Differences in Service Ergonomics Due to the Introduction of IP

Technical Product Development—Technical Product Design

Assessment of Current Status of Network/Platform Resources

Preparation of the TCO and Technical Solution Documents

Technical Product Development—Product Implementation

Start of Technical Product Development Implementation

Integration of New Platforms or Extension of Existing Platforms, Quality Control, and Handover

NT Rollout

Network and Technical Product Readiness

Definition of the Migration Enabler

Major Network Deployment Plans

Internal Resources Preparation and Planning

IT Roadmap

IT Application and Product Readiness

Identification of Required Changes to IT Applications

Adaptation of Existing IT Systems/Development of New IT Systems

Adaptation of Interfaces toward the Network

Customer Migration Process within IT

Development of the Migration Process

Development of All Regular Processes

Enable Migration Reporting

Interdependencies with Other General Projects

Identification of Interdependencies with the Current IT/NT Corporate Projects

Identification of Interdependencies with Current IT/Corporate Projects

Evolution of the Network from Legacy (PSTN/ISDN) to the New IP Platform

Business Case Framework

Calculation Methods

Calculation Rules

Scope of Business Case Items

Financial Impact Calculation

Project Assumptions

Scenario Definition

Input Need from Work Streams

Milestones of Business Case Calculation

Input for the Migration Scenario

Input for Interim Solutions

Business Case Structure

Revenue and Cost Base and Business Case Baseline

Go to Market

Communication Plan

Communication Strategy (Including Benefit Story)

Communication Plan

External Communication

Internal Communication

Sales Channel Plan

Steering and Orchestrating the Sales Channels

Preferred Sales Channels as Customer Touch Points

Channel Focus per Migration Phase


Cross-Sell, Upsell, and Retention



Sales Force Training

Key Account Manager (KAM) Training

General "All-Employee" Training

Migration Support Customer Care and Technical Service

Involvement of Customer Care and Technical Service in the PSTN Migration Process

Planning of Demand Volume


About the Author

Sandra Dornheim is project manager at Deutsche Telekom, Europe and Technology, with a focus on go-to-market and launch management. Over the past two years she was responsible for the go-to-market work stream within the IP transformation and PSTN migration initiative at Deutsche Telekom. After graduating with a master’s degree at the University of Mainz (Germany) in business and economics, she started working for Deutsche Telekom. She has 11 years of telecommunication experience within different organizations and projects, however, her focus has always been on marketing and sales. She completed her second master’s of science degree in strategic marketing leadership at the Henley Business School in the United Kingdom.

Subject Categories

BISAC Subject Codes/Headings:
TECHNOLOGY & ENGINEERING / Telecommunications
TECHNOLOGY & ENGINEERING / Mobile & Wireless Communications