def voip(self):
        """
        Access the voip

        :returns: twilio.rest.api.v2010.account.available_phone_number.voip.VoipList
        :rtype: twilio.rest.api.v2010.account.available_phone_number.voip.VoipList
        """
        if self._voip is None:
            self._voip = VoipList(
                self._version,
                account_sid=self._solution['account_sid'],
                country_code=self._solution['country_code'],
            )
        return self._voip
def voip ( self ) : if self . _voip is None : self . _voip = VoipList ( self . _version , account_sid = self . _solution [ 'account_sid' ] , country_code = self . _solution [ 'country_code' ] , ) return self . _voip
Access the voip

        :returns: twilio.rest.api.v2010.account.available_phone_number.voip.VoipList
        :rtype: twilio.rest.api.v2010.account.available_phone_number.voip.VoipList