Echo Request/Response

GTP-C, GTP-U, GTP’

Echo Request is sent on a path to another GSN to determine if the other node is alive. Echo Response is the reply.

Version not Supported

GTP-C, GTP-U, GTP’

There are multiple versions of GTP. Both devices communicating must use the same version of GTP, or this message will be the response.

Support Extension Headers Notification

 

Extensions are optional parts that a device can choose to support or not. If a device includes these extensions, it must include headers for the extensions to sure ensure proper formatting.