SIP INFO and DTMF UII Management
The Oracle® Enterprise Session Border Controller supports DTMF for that require the IWF, enabling features such as keypress, alphanumeric, and hookflash. Because tones are not transmitted as audio, they must pass as out-of-band signaling information, meaning that the Oracle® Enterprise Session Border Controller needs to convert an H.245 UII (User Input Indication) into SIP.
Depending on the capability of the H.323 endpoint, the Oracle® Enterprise Session Border Controller sends either an alphanumeric or DTMF signal in the H.245 UII. The Oracle® Enterprise Session Border Controller sends nothing if the endpoint does not support an alphanumeric or DTMF signal. The SIP INFO message will have a content type of application/dtmf-relay, and the message body will be in the form Signal=*\r\nDuration=250\r\n. If the duration is absent in the SIP INFO or the UII received on the H.323 side is alphanumeric, the Oracle® Enterprise Session Border Controller uses the a 250 millisecond default value.