Sx Message Priority

This section describes the Sx message priority.

Based on the VoLTE flags (volteSession and volteBearer), SGW sets the message priority in Sx request messages (Sx-Est, Sx-Mod, and so on) while processing the received requests/responses (for example, S5-CBReq, S11CBResp, S11-UBRes, S5DBReq, and so on).

Sx Message Priority is set when the session is marked for volteSession (or it has VoLTE QCI).

In Sx Req (Establishment or Modification) Message Header:

"HEADERS": {
      "length": 30,
      "msg_type": 52,
      "priority": 2,        <<< VOLTE Session priority value
      "priority_flag": 1,   <<< Priority flag is true i.e 1
      "retransmit": 0,
      "seid": 10002,
      "seid_flag": 1,
      "seq_number": 22,
      "version": 1
    },