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This usually points to a firewall or network problem. Ensure that UDP ports 5060 (SIP) and 10000–20000 (RTP audio) are whitelisted in your local network firewall. Zoiper 2.43 Free Download

: Older versions do not receive security patches. Hackers can exploit known flaws if the software is exposed to the open internet. To help me provide more tailored information, please

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