6.4. UII Alphanumeric Parameter Usage

In the NetTSC embedded stack implementation, the IPPARM_UII_ALPHANUMERIC parameter had a dual role:

• If the application was using out-of-band (OOB) DTMF (as defined by setting PrmDTMFXferMode to 2 [default] in the .config file), then IPPARM_UII_ALPHANUMERIC was used for DTMF.
• If the application was using in-band DTMF (as defined by setting PrmDTMFXferMode to 1 in the .config file), then IPPARM_UII_ALPHANUMERIC was used to send messages to the application at the remote side.

In the host-based stack implementation, the .config file is not used. DTMF and application data transfer is achieved as follows:

• The application uses IPSET_DTMF with IPPARM_DTMF_ALPHANUMERIC (which is the same value as IPPARM_UII_ALPHANUMERIC) to send DTMF.
• The application can use User Input Indication (UII) non-standard, or Q931 User-to-User Information (UUI) to send information to an application at the remote end.

See the Global Call IP Technology User's Guide for more information.

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