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Is it necessary to use encryption when sending or receiving VoIP traffic, and what are the most common methods used?
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Yes especially for sensitive or enterprise-grade voice communications, encryption helps prevent interception and fraud.
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The industry standard is SRTP for media and TLS for signaling this combination protects both voice data and SIP messages.
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Not all carriers support encrypted traffic always verify with your supplier if SRTP/TLS is enabled and stable.