SIP 488 Not Acceptable Here
The 488 Not Acceptable Here error in SIP means that the connection between endpoints was established, but the session parameters could not be negotiated. This typically happens when the client and server cannot agree on codecs, media formats, or security settings.
Main Causes of 488 Not Acceptable Here
- Codec mismatch between SIP client and server
- Unsupported media encryption settings (SRTP/TLS)
- Incorrect SIP trunk configuration
- Provider-side restrictions or policies
- Misconfigured media parameters
How to Fix the 488 Not Acceptable Here Error
- Check and adjust codec settings (e.g., enable G.711)
- Disable media encryption if not supported
- Verify SIP trunk settings (transport, NAT, media)
- Follow your VoIP provider configuration guidelines
- Contact your PBX administrator if needed
The SIP 488 error is caused by incompatible session parameters. In most cases, it can be resolved by adjusting codecs, encryption settings, and SIP configuration.