Go to Options > SIP Accounts > Add New SIP Account .
Click the "Register" button. Once it turns green, you are ready to make calls. Security Warning Need a download link for Zoiper version 2.43 i--- Zoiper Classic 2.43 Download
You can find the legacy version directly on the Official Zoiper Classic Download Page . Go to Options > SIP Accounts > Add New SIP Account
Seamlessly handles both SIP and IAX2 protocols, making it compatible with most PBX systems like Asterisk or 3CX. i--- Zoiper Classic 2.43 Download