SILENT CARRIERS AND LINK PROTOCOLS – As we all know, “wardialing” is one of the best entertainments for hacking/phreaking lovers. Sometimes this activity makes us desperate due to the usual “login: password:” repetition that appears in nearly every CARRIER. It’s also usual to find Carriers that present us with no message just a “CONNECT xxxxx”. These ones are usually very interesting as you will see in this document.
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Source: https://packetstormsecurity.com/files/10722/mi008en.htm.html