Used to create MMTel user service data The default public user identity for the subscriber. This identity must already be configured on the HSS.# Used to modify MMTel user service data The concurrency-control element is an optional element to control concurrent updates. If present then the set request will be accepted only if the service data version is still at the value given in this element i.e. no other updates have been performed. It is of type integer. Contains the currently configured MMTel user service data The default public user identity for the subscriber The concurrency-control element is an integer value indicating the current version of the MMTel service data. This value can be used in a subsequent setMMTel request to make sure that no changes have been made to the service data since the version that was read