Sip may signal functionality with a participant.Logical formLearned from2 sentences. A functionality may be defined within a framework.Logical formLearned from2 sentences. A functionality may change for purposes of peerings.Logical formLearned from2 sentences. An end may point functionality.Logical formLearned from2 sentences. A service may support a functionality.Logical formLearned from2 sentences. A functionality can be for use of modalities.Logical formLearned from2 sentences. A query may constitute a core of a functionality.Logical formLearned from2 sentences. A usage may impose requirements on a functionality.Logical formLearned from2 sentences. A functionality may pertain-to a (presence service).Logical formLearned from2 sentences. A field may provide functionality.Logical formLearned from2 sentences. A header can be vital for a functionality.Logical formLearned from2 sentences. A server may pertain-to a functionality.Logical formLearned from2 sentences. Support can be from a server of a functionality.Logical formLearned from2 sentences. Some feature-tag may represent functionality.Logical formLearned from2 sentences. A feature-tag may represent a block of functionality.Logical formLearned from2 sentences.