It is not easy (by a mile), but can be done. have a look at http://www.dslreports.com/forum/remark,14450684
M wrote:
Hello, I nearly forgot about this mailing list! I accidentally bought a vonage enabled PAP2 to use on my asterisk, however it's locked and I have no access to the admin password. Anyone unlocked it before? Please send procedure. Make a cc to my address please. Thanks a million.
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