This document provides a description for voluntarily consenting vendors (subsequently referred to as 'participating service providers??)@ who wish to provide TPS-eCall service in an open market environment@ where users can select and change the service provider. It focusses on the use case 'TPS-eCall service'@ as standardized in EN 16102@ only (and for clarification@ does not apply in respect of 112-eCall@ where no TPS provider is involved.) The document determines the preconditions@ requirements and functional means needed in order that users of a TPS-eCall service can choose and change her/his preferred service provider (TPSP) out of a range of available TPSPs@ who are participating in the open market provisions determined in this specification. Outside the scope of this document are: a) any commercial considerations (e.g. whether the service is offered for free or a charged service or part of a commercial service package offer)@ b) any contractual considerations (e.g. how a service contract between an user and a TPSP is established)@ c) any IT-security related issues in conjunction with the TPS in-vehicle system@ d) any considerations regarding communication costs (for voice and data) related to the TPS-eCall service e) any PSAP related considerations (towards the PSAPs there is no impact related to provider change@ since any TPSP needs to negotiate acceptance of its service offering with the PSAPs in the countries where the service is provided@ before such service can be provided).