The present Master Thesis deals with the development of a brand identity concept and a guideline for the external brand identity implementation for the market-leading telecommunication company Commend International GmbH, based in Salzburg, Austria. The aim of the company is to get a clearly stated brand identity based on the perception of the strongest corporate markets Austria, Germany and United Kingdom. A sub goal is to anchor this brand identity in the minds of existing and new customers. The aim of the Master Thesis is to develop this brand identity as well as an external implementation guideline. The present work is divided into three segments. The first segment presents the initial situation, the problems and challenges, the goals and the literary frame of reference of the work. The second segment is the theoretical background of the work. It provides the basis for the third, practical part and focuses on brand management, brand identity and external communication. Here, the terminology is defined, the high-tech sector is presented, and the effects and challenges of international identity-based brand management are presented. The third chapter deals with the presentation of relevant brand identity approaches, the critical comparison of these and the decision for the most suitable concept for the further course of the present work. External communications and brand controlling are presented and discussed in the last chapters of the theoretical part. After a detailed analysis of the global intercom market and the initial situation, the conducted market research is presented in the practical section. Taking the re-search results into account, an identity-based brand steering wheel was developed in a joint workshop with the company management and the author of the present work. The way in which this developed brand identity can be implemented and controlled across selected communication channels, is finally presented in the external communication guideline as practical recommendations for Commend International’s management.