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Re:Ringless voice mails from telemarketers by spc476 on Saturday June 03, 2017 @07:13PM (#14479015)
I can confirm. At work I have to deal with call processing [1], and the time guard [2] is 15 seconds on the originating side [3] for CDMA [4].

[1] We provide enhanced caller ID---a name in addition to the phone number. Our new product will also mark known telemarketers.

[2] The amount of time we have to do what we do

[3] The calling party---the one initiating the phone call.

[4] which may be enough to identify the carrier we work with.

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