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: Zoiper will attempt to detect the correct protocol (UDP, TCP, or TLS). If it fails, check your Network Settings for the correct port (commonly 5060 for SIP). zoiper 37 full download
Do search for or download "zoiper 37 full download." The number "37" is a red flag. If you actually need Zoiper 3.7 (an obsolete version), it will lack modern encryption (TLS/SRTP) and will not work with most current VoIP servers. : : Zoiper will attempt to detect the