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Yeah, that’s usually not just spam it’s often a voice transmission issue.

Most times it comes from codec mismatch, SIP trunk config, or RTP/audio not flowing properly, so the call connects but no audio is exchanged. I’ve seen this a lot with setups using providers like Telnyx or similar.

I can help you quickly trace it checking SIP settings, codecs (like G711), NAT/firewall, and RTP flow to pinpoint exactly where the audio is breaking 
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