Options for Computer Telephony Integration (CTI) Add-on for SugarCRM (On-Prem)

We're looking into which CTI add-ons are available and recommended for an on-premise Sugar instance for a prospect client.
So far we have 2 options, both of which are still on POC with issues supplied:

1) Yeastar's S-Series VoIP PBX via TechExtension's AsterCTI - recommended that the instance be hosted in CentOS 7 which will reach EOL in the coming years. Call pop-up is also not native to the system but through Chrome extension which the client does not want.

2) Rolustech's RT Telephony

We'd like to ask for more options on your end especially if there are other existing on-prem clients that has integrated CTI with their instances.

Looking forward to working this out. Thanks!