> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/configuration/web-portal-3-3/protocol-stack/h-248-megaco/selecting-timeslots-for-tdm-interfaces.md).
# Selecting Timeslots for TDM Interfaces
> **Applies to:** Tmedia 3.0, 3.2, 3.3
The final step in the H.248 configuration is to assign timeslots to the TDM interfaces that are associated with the H.248 configuration.
1- Click **H.248** in the naviagtion panel.
2- Select the line service you wish to configure, in the H.248 configuration window
(**NOTE:** A timeslot mask can be applied to all line services at once by selecting **Timeslot mask for all line services** instead)
3- Select timeslots:
* Add the desired timeslots by **checking individual boxes**, or simply select all timeslots by clicking **Select all**
* Click **Save**
4- Verify that the **"h248\_fix\_term\_cfg was successfully updated"** message appears
Northbound Interface
**Path**
```
h248_statcks->gateway_h248->h248_tdm_terminations->YourTrunk->TimeslotMask
```
---
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