The OC-IM-CallReferenceNumber header is a custom SIP header used by Sentinel VoLTE SCC-AS to send the Call Reference Number to the IM-SSF to use in future messages.

Header Format

The header name is OC-IM-CallReferenceNumber and its value is a string representing the 8 bytes of the call reference number in Hexadecimal format. The header does not have any special parameters.


OC-IM-CallReferenceNumber: 006500655F68D12B

Header Usage

The header is set by the FetchMSRN Feature.

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Sentinel VoLTE Version 3.1.0