SIP-Number-Auth-Items AVP ( 607 )
When used in a request, the SIP-Number-Auth-Items indicates the number of authentication vectors the S-CSCF is requesting. This can be used, for instance, when the client is requesting several pre-calculated authentication vectors. In the answer message, the SIP-Number-Auth-Items AVP indicates the actual number of SIP-Auth-Data-Item AVPs provided by the Diameter server.
Reference: 29.229-e20
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