LLRP Custom Extension

Dear Zebra Support Team,

Good day..

currently i'm use Zebra FX7500 Reader and Using C# as programming language..

I want to get Phase Angle data using LLRP Method.

but to to get this data, i need Motorala LLRP Custom extension..

where i can get this LLRP Custom extension library.. i can't found in this web..

anyone can help me..

Thank youz