This is a function of UCCE not Finesse. According to the UCCE SRND, there is a maximum of 2 call appearances.
See http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cust_contact/contact_center/icm_enterprise/icm_enterprise_10_0_1/Design/design_guide/UCCE_BK_UEA1023D_00_unified-cce-design-guide.pdf
Section on Agent Phones.