Polycom IP 7000/Yealink T41S - Can we use secure SIP?

[SBNGT]

Hello,

We have 6x Polycom IP 7000 and 65x Yealink T41S devices. Can we use Secure SIP? Our provider supports it and our PBX is using the 3CX-provided FQDN. Our PBX passes all the tests.

My concern is the IP7000s.

Thanks in advance,