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SIP calls receive a fast busy signal
Symptoms
  • SIP calls receive a fast busy signal, since SIP session progress packets are not being NATed.

  • sipdebug kernel debug shows:
    DATE TIME.PID... sip_ws_parser: Start parsing the SIP packet;
    DATE TIME.PID... ws_parse_request_line: [WARNING]: Unknown method found in request;
    DATE TIME.PID... ws_parse_request_line: [WARNING]: method SIP/2.0 is unknown to parser;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 'S';
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 'e';
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 's';
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 'i';
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 'o';
    DATE TIME.PID... ws_parse_proto_version: [WARNING]: request parsing failed due to a malformed HTTP protocol name:;
    DATE TIME.PID... ws_parse_proto_version: [WARNING]:   expected: 'H', received: 'n';
    DATE TIME.PID... ws_parse_request_line: [WARNING]: request parsing failed due to a malformed HTTP version;
    DATE TIME.PID... sip_ws_parser: Parsing failed!;
    DATE TIME.PID... sip_run_parser: Generic parsing failed
Cause

Security gateway cannot parse these messages and as a result cannot translate the content, that is why the busy signal is received


Solution
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