4.1 EPID Mechanism

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The following REGISTER request demonstrates use of the epid parameter in the From header field.

REGISTER sip:contoso.com SIP/2.0
From: <sip:alice@contoso.com>;tag=33975904fc;epid=01010101
To: <sip:alice@contoso.com>
Call-ID: 21c7d6e384c249afac26e3f3016140a6
CSeq: 88 REGISTER

Note that other SIP headers in the SIP request are not included.