FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device.
From rfc8224 https://datatracker.ietf.org/doc/html/rfc8224#page-7
Note that unlike the prior specification in [RFC4474], the Identity header field is now allowed to appear more than one time in a SIP request.
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original code from Telnyx