doc/modules/cassandra/examples/CQL/insert_udt.cql

INSERT INTO user (name, addresses)
   VALUES ('z3 Pr3z1den7', {
     'home' : {
        street: '1600 Pennsylvania Ave NW',
        city: 'Washington',
        zip: '20500',
        phones: { 'cell' : { country_code: 1, number: '202 456-1111' },
                  'landline' : { country_code: 1, number: '...' } }
     },
     'work' : {
        street: '1600 Pennsylvania Ave NW',
        city: 'Washington',
        zip: '20500',
        phones: { 'fax' : { country_code: 1, number: '...' } }
     }
  }
);