What is SIP?
SIP (Session Initiation Protocol) is the signaling protocol that powers VoIP telephony. It enables devices to set up, manage, and end phone calls over the internet, making real-time voice communication possible. On this page, you’ll find a clear overview of how SIP works, how to configure it properly, and what to check when you run into issues or error messages.
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How to set up SIP correctly
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Common SIP Errors (Response Codes)
Secure Your SIP Traffic
SIP traffic can be vulnerable if not properly secured. To protect your phone system:
- Use strong, unique SIP passwords
- Disable any unused SIP accounts
- Enable encrypted calling to keep your conversations private
If your current device doesn’t support encryption, we strongly recommend switching to a device or softphone that does.
Related Pages
SIP response codes
SIP response codes
SIP settings for VoIP Telephony SIP settings for VoIP Telephony
Optimizing audio codecs for the best VoIP experience Optimizing audio codecs for the best VoIP experience