Item-Number AVP主要出现在S6a接口的EPC鉴权消息中。根据3GPP规范29.272的说明,当在一个Authentication-Info AVP中包含了多个EPS或EUTRAN或GERAN的鉴权向量参数,就需要在Item-Number AVP中指明包含的数量。3GPP原文如下:
”If more than one EPS or UTRAN or GERAN Vector is to be included within one Authentication-Info AVP, the Item-Number AVP shall be present within each Vector.“
以下为实际报文中XRES AVP的截图:
[attach]2259[/attach]
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