About H.245 UII

H.245 provides a capability exchange functionality to allow the negotiation of capabilities and to identify a set of features common to both endpoints. The media and data flows are organized in logical channels. H.245 provides logical channel signaling to allow logical channel open/close and parameter exchange operations. The H.245 signaling protocol is reliable, which ensures that the DTMF tones will be delivered.

H.245 User Input Indication (UII) plays a key role in all the services that require user interaction. For video messaging, typical uses of UII include selection of user preferences, message recording and retrieval, and typical mailbox management functions. H.245 UII provides two levels of UII, alphanumeric and signal.