Search does return the phoneNumbers array for me

async function search_user() {
    var params = {
          filter: 'userName eq "ryan.lee@live.com"'
    }
    try {
      var resp = await platform.get('https://platform.ringcentral.com/scim/v2/Users', params)
      console.log(resp)
      var jsonObj = await resp.json()
      for (var res of jsonObj.Resources)
        console.log(res)
    }catch(e){
        console.log(e)
    }
}
// Response
{
  schemas: [ 'urn:ietf:params:scim:schemas:core:2.0:User' ],
  id: '62358325016',
  meta: {
    resourceType: 'User',
    created: '2021-11-05T02:50:47.257Z',
    lastModified: '2021-11-05T02:50:47.257Z',
    location: 'https://platform.ringcentral.com/scim/v2/Users/62358325016'
  },
  userName: 'ryan.lee@live.com',
  name: { formatted: 'Ryan Lee', familyName: 'Lee', givenName: 'Ryan' },
  active: false,
  emails: [ { value: 'ryan.lee@live.com', type: 'work' } ],
  phoneNumbers: [
    { value: '+13033763519', type: 'work' },
    { value: '11889', type: 'other' }
  ]
}

Hey Phong - Many thanks for the code example.

I believe the search filter is applied to results on the client-side, yes?

AOK for a hundred or so users/Extensions. A few thousand, that would create rather thick return array when only one Email address is the search objective.

Of course, if the search/filter is applied server-side, returning only the details of the queried userName (Email address).

If the filter is applied server-side, where might I find the various filters than can be applied to such queries?