If you are trying to set up voice services, follow the path relevant to your account type:

To set up an Ooredoo SIP service, you generally need to input the following parameters into your SIP-compatible device: : Set to UDP (Port 5060).

: May be required depending on your network architecture.

: For SIP-T setups, you may need to configure specific static routes on your router to reach the Ooredoo SIP gateway IP. Working with large SIP packets - Cisco

There is no official "Ooredoo UDP SIP" application to download, as is a standard protocol used by Ooredoo for business voice services rather than a standalone app. Most users looking for "download" content on this topic are typically seeking the configuration settings to register an Ooredoo SIP Trunk on their existing hardware (like a PBX or Cisco router) or a third-party softphone. Core Configuration Parameters