Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to find the number of a blocked call [title] Get an private branch exchange (pbx) account. [step] One option is asterisk, a free, open source software. Another is switchvox.

Ending1: This will also work better than 200 blackwire. If you buy one, it will work with the same account ($ 0.11). Ending2: The pbx is considered to be a free exchange. While this service typically does not have much use for a desktop account, it gives you access to many anonymous call accounts. Ending3: A pbx converts your computer into a telecommunications device and will allow you to manipulate incoming call data to identify blocked callers. [substeps] Before embarking on this method ensure that you thoroughly understand the technical challenge it presents and the potential financial burden it incurs. Ending4: Without switchvox here you are on better business. No other option is available to get a contact number from an online website.

Answer format: ending1/ending2/ending3/ending4