Nem feltétlen szerintem. Az én sip szolgáltatóm (gondolom nem az egyetlen) ellenőrzés után (fel kellett hívni egy számot, majd nyitni egy ticketet) ugyanúgy a Telekomos számom küldi mint a mobilom.
Előkotortam:
To verify an International Number:
Please place a call, with your caller ID unblocked, from each of the International lines/numbers you would like to use as an outbound caller ID to 1-866-xxx-xxxx. You will hear an error message then hang up.Open a Trouble Ticket on your account asking to get your International Number(s) verified.
Include within the trouble ticket the International Numbers you would like added on your account, and the approximate date, time, and time zone you placed the verification calls to the Toll Free number listed above. Once we verify that we have received your calls for the listed numbers we will add those numbers as verified numbers on your account and update your ticket.
Once we have properly verified your numbers and updated you, you can then begin using these caller IDs by setting your desired caller ID in your preferences, or by sending them out selectively.