I'm using a WP8.1 device where I synchronize my contacts with Outlook. In Outlook the standard format for telephone numbers is +xx (yyyy) zzzzzzz and it's copied into the phone's contacts exactly this way.
Unfortunately the SIP provider expects phone numbers without any special characters apart from the leading '+', e. g.
+123 (777) 999999 does not work, it has to be translated into
Any idea how Zoiper can do that? I tried some settings but with no success.