When you have the Telmediq application on your iPhone, by default notifications will be sent to your Apple watch and not your iPhone. For more information on Apple watch notifications and how they are delivered please see this article from Apple here
Apple watch notifications will always use the default notification tone, custom notifications are not currently supported.
Note: If you silence notifications, or turn on do not disturb on your Apple Watch you will not receive any audio alerts for messages from Telmediq. You can adjust these settings, and the volume of your alert tones by following the instructions posted by Apple here.
If you want to adjust your notification mirroring settings, follow the instructions here. Where you will be able to toggle on and off receiving Telmediq notifications on your Apple Watch from the Apple Watch Notifications menu: