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How can I avoid purchasing or routing traffic through blacklisted or blocked VoIP routes?
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Request full CDRs with ASR, ACD, and signaling cause codes over at least 1-2 weeks to detect instability or blocking patterns.
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Use test routes to call major carriers (like Vodafone, Orange, T-Mobile) and verify whether calls connect cleanly without SIP errors.
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SIP errors such as 403, 603, or 503 often point to blacklisting or delivery rejection by the destination network.
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Only work with providers who offer transparency on route origin and agree to blacklist compliance clauses in your SLA.
How can I avoid purchasing or routing traffic through blacklisted or blocked VoIP rou
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