Zoiper seems to be replying to private address space (10.x.x.x). Is this what you want in your setup? If zoiper is connecting from outside your network you may need to check off the rPort settings in zoiper for signalling and media.
Values for filling in the zoiper fields are found in Kazoo's UI's device details. Kazoo's UI is called Monster, for future reference.You probably created a Softphone type device so the settings should be on the basic tab. Most other types you will find them in the Advanced, SIP tab.
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