olemus
ISO/IEC 27011:
spetsiifiliste lõppseadmetega sideteenus, mis vajab
käsitlemist eelistusega, üldkõnede kitsendamise arvel,
spetsiifilised lõppseadmed võivad anda mitmesuguseid teenuseid
(netitelefon, harilik telefonside, IP-andmeliiklus) kaabel- või kaablita võrkudes
= telecommunications made by specific terminals in the event of emergencies, which should be handled with priority by restricting public calls
Note. The specific terminals may span different services (voice over Internet protocol (VoIP), public switched telephone network (PSTN) voice, Internet protocol (IP) data traffic, etc.) for wired and wireless networks.

ülevaateid
https://en.wikipedia.org/wiki/Priority_call

vt ka
https://datatracker.ietf.org/doc/html/rfc3487