Calls Interacting with a Selection Dependant Routing (SDR) Node and an IVR are Dropped if Caller Selects an Unspecified Menu Option (Doc ID 1533173.1)

Last updated on MARCH 27, 2023

Applies to:

Symptoms

During calls the Selection Dependent Routing (SDR) node can be configured to interact with IVR (Interactive Voice Response) network elements (via a telephone keypad or by speech recognition), using PACUI (Prompt And Collect User Infomation) INAP signalling messages to communicate.

When a caller makes an incorrect choice for a menu selection (that is, the selected option is not configured as a valid response in the SDR node), then the SDR node can be configured to tell the IVR to play an invalid digit selected announcement before repeating the main menu prompt, so the caller may try again.  However, the repeat (second) PACUI network message results in the IVR responding with a TCAP_U_ERROR 15 error resulting in the call being dropped.

The Service Logic Controller's (SLC) slee_acs process will report the following warning message in its syslog file (/var/adm/messages), if this issue is encountered:

Changes

NCC 4.4.1.2 (Galaxy Patchset 2) introduced a new fast timeout feature in the SDR node.  The fast timeout configuration option enables the call flow logic to take a specific node exit branch after the timeout period has expired.  For example, you can use the fast timeout option so callers go directly to an Operator after timing out, for voice prompts such as "Press 1 for x, 2 for y, or hold for an operator."

Cause

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