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in Windows Phone by (120 points)

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If experiencing “registration failure” it is very likely to be related to a network discovery issue, please try the following settings:

Go to Settings -> Accounts -> choose your account and select "Edit" -> swipe to Network Settings and enable or disable STUN.

Default STUN values:
Server hostname/IP: stun.zoiper.com
Port: 3478 UDP/TCP
Refresh period: 30

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