# Enabling ad ID signaling for sessions
Session State

The ad ID signaling feature must be enabled during session initialization. The process to enable the feature differs from creating sessions using the HLS/DASH playback prefix (implicit session initialization), versus the session initialization prefix (explicit session initialization).

**To enable ad ID for the session using HLS/DASH playback prefixes**
+ From the player, initialize a new MediaTailor playback session using a request in one of the following formats, according to your protocol:
  + Example: HLS format

    ```
    GET <mediatailorURL>/v1/master/<hashed-account-id>/<origin-id>/<asset-id>?aws.adSignalingEnabled=true
    ```
  + Example: DASH format

    ```
    GET <mediatailorURL>/v1/dash/<hashed-account-id>/<origin-id>/<asset-id>?aws.adSignalingEnabled=true
    ```

**To enable ad ID for the session using the session initialization prefix**
+ On the player, construct a JSON message body for the session initialization request to MediaTailor: 
  + Inside an `adsParams` object, provide any parameters that MediaTailor should pass to the ADS. These parameters correspond to `[player_params.param]` settings in the ADS template URL of the MediaTailor configuration. 
  + To enable ad ID signaling, add an `adSignaling` object as a top level object, and inside, add a parameter called `enabled` and value of `true`. The default `adSignaling` value is `disabled`.
  + Example: HLS format

    ```
    POST master.m3u8
        {
           "adsParams": {
               "deviceType": "ipad"
           },
           "adSignaling": {
               "enabled": "true"
           },
           "reportingMode": "client"
        }
    ```
  + Example: DASH format

    ```
    POST manifest.mpd
        {
            "adsParams": {
               "deviceType": "ipad"
           },
           "adSignaling": {
                "enabled": "true"
            },
            "reportingMode": "client"
        }
    ```