Enterprise telephone system responsible for managing a limited number of external phone lines. Originally used analog technology, but recently there has been a switch to digital technology.
Postamble
For grammars built with Microsoft Speech Server SDK, words and phrases that appear at the end of a user's spoken text.
Preamble
For grammars built with Microsoft Speech Server SDK, words and phrases that appear at the beginning of a user's spoken text.
PSTN Public Switched Telephone Network
Collection of public telephone networks owned by governments and private companies.