On my CLI display scam calls used to appear as "witheld", now more are appearing as "not available". I am able to use 14258** to bar those in the first case but not the second. What is the difference in the network between these types of call, please?
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OK - my understanding whilst you wait for a better answer.
On "normal" phone systems.
Number withheld means that whoever phoned you has deliberately withheld their number (1471 etc.). This type of number can be blocked by using anonymous call reject (but that blocks all withheld numbers not just the specific latest one).
Number not available means the system does not know the originating number in order to display it, VoIP calls, most overseas calls, scammers (faking invalid numbers) etc..
Thanks, I rather thought that that would be the case.
I presume that if the number is originated on the "local" network but withheld then it is still recorded in the PSTN (cf 999 calls) whereas if the call is an inbound IDD call and the number is withheld at the point of origin the "foreign" carrier will not forward the CLI and so the "local" PSTN will not see the number at all.