SIP Response Cause-Code Mapping for Accurate Call Failure Analysis
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Solution Overview
Problem
Existing Session Initiation Protocol (SIP) systems often incorrectly assign dummy cause codes to final error responses, leading to inefficiencies in call handling and analysis, particularly in contact centers where auto dialers rely on incorrect Q.850 cause codes under provisional responses.
Innovation Solution
A system and method for mapping SIP responses with appropriate cause codes by determining pre-defined cause codes in provisional and final SIP responses, modifying error codes as needed, and using a cause-code mapping table to ensure accurate assignment of cause codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If auto dialers use provisional SIP responses with Q.850 cause codes, then call handling efficiency is improved, but incorrect cause codes are assigned leading to inaccurate call analysis
Solution Approach 1:
The system performs preliminary mapping of SIP response codes to Q.850 cause codes in advance, before actual call handling. A mapping table is pre-configured with correct correspondences, allowing the auto dialer to accurately determine cause codes for provisional responses without real-time analysis, thus maintaining both efficiency and accuracy.
Solution Approach 2:
The patent introduces an intermediary mapping table that acts as a mediator between SIP response codes and Q.850 cause codes. This mapping table contains pre-defined correspondences and serves as a reference for the auto dialer to accurately translate SIP responses into correct cause codes, eliminating direct incorrect mapping.
2Device complexity
If final SIP error responses contain dummy cause values, then system complexity is reduced, but analytical data quality deteriorates
Solution Approach 1:
The system enables final SIP error responses to self-determine their cause codes by referencing the pre-configured mapping table. Instead of requiring external intervention or complex real-time analysis, the system automatically maps the SIP response code to the correct Q.850 cause code using the stored mappings, thus maintaining accuracy without adding significant complexity.
3Ease of operation
If SIP response mapping is simplified, then ease of operation is improved, but cause code accuracy deteriorates
Solution Approach 1:
The complex mapping relationships are established in advance through configuration rather than real-time computation. The mapping table is pre-populated with correct SIP response code to Q.850 cause code correspondences, making the actual operation simple (just lookup) while ensuring accuracy through pre-validated mappings.
Solution Approach 2:
The patent uses a mapping table that copies and stores the correct correspondences between SIP response codes and Q.850 cause codes. This copied reference data allows simple lookup operations while maintaining the accuracy of the original mapping relationships without requiring complex real-time transformation logic.
Data Source
AI summary
The present disclosure generally relates to message processing in communication systems, more particularly to systems and methods for mapping Session Initiation Protocol (SIP) response with appropriate cause code. BTAS receives SIP response, and determines reason for error in call, and cause code for error. BTAS maps SIP and appropriate cause code. BTAS provides, in SIP response, appropriate reason for call failure or call error. Call is sent to E-SBC, routed from E-SBC to P-CSCF, and routed from P-CSCF to S-CSCF. A query is sent from S-CSCF to DNC server regarding DNC registration of B number. DNC server answers, if B number is registered/Non-registered for DNC. Call is forwarded to BTAS, and query is sent from BTAS to MNP. BTAS routes call to S-CSCF. Wireline calls to terminating BTAS, in which VOLTE calls to TAS, and offnet calls to MGCF via BGCF. Offnet calls is sent from BGCF to MGCF.