Download Lync 2013 Headers for SIP Trunk provider billing from Official Microsoft Download Center

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Lync 2013 Headers for SIP Trunk provider billing

The implementation of these headers will enable SIP trunk providers to more effectively bill for their services for calls forwarded or transferred to another PSTN number while enabling some level of fraud prevention/detection in the SIP trunk provider network (identifying that the outbound call is indeed from a number on their network).