The ETSC COT parameter can be used to define a virtual network limit for transferring proprietary user-to-user-service message elements (e.g. for CMI Cordless Multicell Integration, NW-CHESE, etc.). Wherever the ETSC COT parameter is set only user-to-user-service message elements are transferred which have been requested in accordance with the ETSI protocol (European Telecommunication Standards). This makes it possible to prevent free user-to-user message elements, as created by CMI, NW-CHESE, etc. for example, from entering the external network. This prevents message backlogs and overloading problems.

TDCSU

Digital trunks

All digital protocol variants that transfer user-to-user message elements, such as CORNV33, ECMAV2, PSS1V2, ETSI, EDSGER, EDSAUT, EDSSUI, EDSFRA