User-to-user information (UUI) is the data provided using ISDN
Supplementary Services as user-to-user services. The UUI feature enables the
information transfer between calling and called ISDN numbers during call setup
and call disconnect with up to 128 octets of data for each message.
involving Unified CVP transfers or disconnects, you can use the UUI feature to
pass ISDN data provided from the PSTN, in the GTD, to the Unified ICM router,
and then from Unified ICM to third-party ACDs.
Ingress and Egress Gateways can use application specific data in the UUI field
for use in CTI applications and for better third-party ACD integration.
example, you can capture data from an external system (such as caller-entered
digits from a third-party IVR) and pass that data to Unified ICM on a new call.
CVP can send UUI in hex-encoded format on the outbound direction of Unified
CVP, for example to the agent or even to the IVR.
is ISDN data, Unified CVP and the gateways support tunneling the ISDN data in
SIP messages on the VoIP side. The data can be encapsulated in the content body
of the SIP message in a Generic Type Descriptor (GTD) content type.
port and codec information is defined as a SDP body type, but the ISDN data is
encapsulated in a Generic Type Descriptor body type by the Cisco IOS Gateways.
When both RTP and ISDN data are sent to Unified CVP through the TDM Gateway,
both body types are sent in a multipart and mixed mime type, that includes both
SDP and GTD parts.
following configuration in the gateway is required to enable the enhanced UUI
voice service voip
signaling forward unconditional