Cisco phone anyconnect sslvpn embedded client with 3rd party firewall instead of ASA? Does it work?

Looking to replace ASA

ref: https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/115945-config-sslvpn-ip-phones-00.html https://www.cisco.com/c/en/us/support/docs/security/anyconnect-secure-mobility-client/116162-trouble-anyconnect-vpn-phone-00.html