The sctpCauseCode read-only property of the RTCError interface provides the SCTP cause code explaining why the SCTP negotiation failed, if the RTCError represents an SCTP error.
A positive integer specifying the SCTP cause code explaining why the error occurred. This property must only be set if errorDetail is sctp-failure, and is otherwise null.
The standard SCTP error cause codes, numbered 1-13, are defined in the SCTP specification: RFC 4960, section 3.3.10.