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The URI for the full RFC4662 format is <sip:~~rl~F~[xecsuserV4r2:USER]@[xecsuserV4r2:DOMAIN]>, where [xecsuserV4r2:DOMAIN] is ~~rl~F~XXXX@domain.tld>, where domain.tld is the sipX's SIP domain, and [xecsuserV4r2:USER] XXXX is the name of the user for which you created the BLF list.
The URI for the consolidated ("Broadworks-style") format is <sip:~~rl~C~[xecsuserV4r2:USER]@[xecsuserV4r2:DOMAIN]>, where [xecsuserV4r2:DOMAIN] is ~~rl~C~XXXX@domain.tld>, where domain.tld is the sipX's SIP domain, and [xecsuserV4r2:USER] XXXX is the name of the user for which you created the BLF list
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