Use sip in freepbx 17 and softphone in Linux

Hello, I am new to FreePBX. I come from Issabel 4, which supports SIP.
how can create extension sip in freepbx17 because i need to login in Microsip.

How can I create a Chan_SIP trunk in FreePBX 17?
I couldn’t find the SIP trunk option, only the PJSIP trunk is available, and I am unable to connect with my Cisco 2921 router.

FreePBX 17 supports SIP, using chan_pjsip, and I’m sure many people are using it with MicroSIP.

To use chan_pjsip, you need to select a version of Asterisk that is no greater than 20. However, that should not be necessary, as chan_pjsip is a better implementation of SIP, so should work, instead.