SIP 502 Bad Gateway Error
The 502 Bad Gateway error in SIP indicates that a server acting as a gateway or proxy received an invalid or no response from another server. This means the request could not be properly processed across the network.
Main Causes of 502 Bad Gateway
- Network instability between servers
- VoIP provider server is unavailable
- Proxy or gateway configuration issues
- Call routing problems
- Temporary infrastructure failures
How to Fix the 502 Bad Gateway Error
- Check network connectivity and stability
- Verify that the provider’s server is reachable
- Review proxy or SIP gateway settings
- Retry the call after some time
- Contact your system administrator or VoIP provider
The SIP 502 error is caused by communication issues between servers. In most cases, the problem lies outside the softphone and requires network or infrastructure troubleshooting.