Guides
Mercurion guides
The rules and measures of voice, explained on one page, with the source alongside.
01
The 0843 and 0844 prefixes: what they are and who uses them
Since 2018 call-centre calls in Italy have two prefixes of their own: 0843 for statistical surveys, 0844 for market research, advertising and sales. The person called knows who is calling before answering.
Read the guide 02The anti-spoofing filter: calls from abroad with an Italian number
Since 19 August 2025 calls arriving from abroad with an Italian landline number are stopped before they arrive; since 19 November 2025 so are calls with an Italian mobile number, unless the phone really is abroad and roaming.
Read the guide 03Voice quality, in twelve words
The measures a carrier and a call centre exchange to tell whether a route works: what they count, and how to read them.
Read the guideShall we talk?