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如何减少VoIP安全问题Apply encryption by segment, device, or user; encrypting indiscriminately can result in excessive network latency or introduce operational overhead and complexity. Encrypt the signaling at your Internet gateway with Session Initiation Protocol (SIP) over Transport Layer Security (TLS); your service provider's switch fabric may do this. Use VPNs for network connections by remote phones. This is especially important when HTTPS or SRTP is unavailable. Apply strong passwords to access the voicemail inbox. Immediately change the default password to a strong password, then change it as often as your company's policy dictates for changing login and email passwords. Delete sensitive voicemail messages as soon as users have listened to them. Not storing voicemails is the easiest and most effective way to protect them. Immediately report anomalies. You may not know a phone has been hacked until an employee reports an odd occurrence, such as a saved voicemail message that has been deleted or forwarded to an unusual number.

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