The ITU-T E115 recommendation specifies the protocol, called the Directory Assistance protocol, to be used for Directory Assistance information exchange among service providers. This supports assistance/inquiry as part of the international telephone operator service. This Recommendation also gives a description of the principles and procedures to be followed in interconnecting different national computerized directory assistance services.
The version 2 of the standard enhances the protocol and defines XER encoding instructions for using XML messages.
The E115 Asn1API is compliant with :