curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"auth":"**put_access_token_here**"}' \
        https://**put_your_bitrix24_address**/rest/crm.activity.communication.fields
        

// This snippet is an ES module: top-level await requires type="module" or a bundler.
        // $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
        import { Text } from '@bitrix24/b24jssdk'
        import type { B24Frame } from '@bitrix24/b24jssdk'
        
        declare const $b24: B24Frame
        
        type CommunicationFieldItem = {
          type: string
          isRequired: boolean
          isReadOnly: boolean
          isImmutable: boolean
          isMultiple: boolean
          isDynamic: boolean
          title: string
        }
        
        // Shape of the payload returned in result (match the "response handling" section of the page)
        type CommunicationFieldsResult = Record<string, CommunicationFieldItem>
        
        try {
          const response = await $b24.actions.v2.call.make<CommunicationFieldsResult>({
            method: 'crm.activity.communication.fields',
            params: {},
            requestId: Text.getUuidRfc4122()
          })
        
          // The payload is available only on a successful response
          if (!response.isSuccess) {
            console.error(response.getErrorMessages().join('; '))
          } else {
            const result = response.getData()!.result
            console.info('Communication field keys:', Object.keys(result))
            console.info('ID field:', result['ID'])
          }
        } catch (error) {
          // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
          console.error(error)
        }
        

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
        <script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
        <script>
          async function fetchCommunicationFields() {
            try {
              // Initialize the SDK inside a Bitrix24 frame
              const $b24 = await B24Js.initializeB24Frame()
        
              const response = await $b24.actions.v2.call.make({
                method: 'crm.activity.communication.fields',
                params: {},
                requestId: B24Js.Text.getUuidRfc4122()
              })
        
              // The payload is available only on a successful response
              if (!response.isSuccess) {
                console.error(response.getErrorMessages().join('; '))
                return
              }
        
              const result = response.getData().result
              console.info('Communication field keys:', Object.keys(result))
              console.info('ID field:', result['ID'])
            } catch (error) {
              // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
              console.error(error)
            }
          }
        
          document.addEventListener('DOMContentLoaded', fetchCommunicationFields)
        </script>
        

try {
            $response = $b24Service
                ->core
                ->call(
                    'crm.activity.communication.fields',
                    []
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            if ($result->error()) {
                error_log($result->error());
            } else {
                echo 'Success: ' . print_r($result->data(), true);
            }
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error fetching communication fields: ' . $e->getMessage();
        }
        

BX24.callMethod(
            'crm.activity.communication.fields',
            {},
            result => {
                if (result.error())
                    console.error(result.error());
                else
                    console.dir(result.data());
            }
        );
        

require_once('crest.php');
        
        $result = CRest::call(
            'crm.activity.communication.fields',
            []
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';
        

from b24pysdk.client import BaseClient
        from b24pysdk.errors import BitrixAPIError, BitrixSDKException
        
        client: BaseClient
        
        try:
            bitrix_response = client.crm.activity.communication.fields().response
            result = bitrix_response.result
            print(result)
        except BitrixAPIError as error:
            print(
                "Bitrix API error",
                f"error: {error.error}",
                f"error_description: {error.error_description}",
                sep="\n",
            )
        except BitrixSDKException as error:
            print(f"Bitrix SDK error: {error.message}")
        except Exception as error:
            print(f"Unexpected error: {error}")