1 = Adds an 'epid' tag to the 'From'header https://wiki.unify.com/images/3/3e/OpenScape_Voice_V6%2C_SIP_to_Phones_Interface_Manual.pdf
5.14.6 epid parameter The client shall use the MAC address of the phone as the EPID as this uniquely identifies the device and is persistent over a reboot of the phone. The format for the epid will be an 8 character ASCI string encoded as follows where "XX" is a two character string identifying the manufacturer of the device, and "SC" is reserved for use by Siemens devices. The client shall include the epid in the From: header of every request generated by the phone (e.g. REGISTER, INVITE, SUBSCRIBE etc.) for non-keyset lines and for keyset primary lines, i.e. epid shall not be included for calls from keyset secondary lines. Example: From:15615299502<sip:15615299502@10.232.3.110:5061>;tag=0470c66c d6;epid=SCBCC441
Example: From: <sip:1014@192.168.178.210>;tag=dd6d1a91-800f-4037-ac55-322665c29b7b;epid=9e74a599
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