- The signaling interfaces of the UMTS Radio Access Network (RAN) protocols (Iu, Iub, Iur, and Rrc) are all described in ASN.1 using PER encoding rules to save bandwidth when transmitting data.

- Intelligent Network Application Part (INAP) specifies in ASN.1 BER the information flows to be exchanged between the different entities of the Intelligent Network functional model.

- H.323 is a multimedia conferencing protocol, which includes voice, video, and data conferencing, for use over IP networks. Protocols of the H.323 series are described in ASN.1 using PER encoding rules.

- Mechanisms used to secure Electronic Commerce on the Internet such as SET (Secured Electronic Transaction) are based on Public-Key Cryptography Standards and X.509 (digital certificates) standards which are defined using ASN.1 and DER.

- Smart cards such as SIM,WIM, VITALE uses ASN.1 for describing the card’s data structure.

- CTI ( computer-telephony integration) is the use of computers to manage telephone calls. Computer Supported Telecommunications Applications (CSTA) which is part of CTI standards (i.e. CSTA) uses ASN.1 with BER to specify the message exchanged between telecommunications equipment and computing applications.

- TAP3 : Transferred Account Procedure is the mechanism that specifies how roaming partners (GSM/UMTS) operators are able to bill each other for the use of networks and services. TAP3 format for roaming billing information uses ASN.1 with BER encoding rules.

- The Aeronautical Telecommunication Network (ATN) is a world-wide data network intended to provide data communications connectivity among mobile platforms, airlines and other companies that provide services such as Air Traffic Control, Flight Information Services, Passenger Communications …. Air-ground protocols such as ADS (Automatic Dependent Surveillance), CPDLC (Controller-Pilot Data Link Communications) are described in ASN.1 using PER.

- Telecommunication Management Network (TMN) and Simple Network Management Protocols use ASN.1 (BER) to describe management information.

There are many others applications field. You may find more information on the ASN.1 Information site at http://asn1.elibel.tm.fr/.