Supports essential office functions including attended transfer , call recording , and conferencing (features vary between Free and BIZ versions).
Go to Options > SIP Accounts > Add New SIP Account . i--- Zoiper Classic 2.43 Download
Some older PBX environments rely heavily on the IAX2 protocol for better NAT traversal, a feature that Zoiper Classic handles with exceptional maturity. i--- Zoiper Classic 2.43 Download