Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
This article provides troubleshooting information for the combination of the SIP 420 error and various Microsoft response codes.
540420 420 Bad Extension
- Microsoft response code: 540420
- SIP response code: 420
- Suggested actions:
- Check the SBC configuration to make sure that it doesn't require an unsupported SIP protocol extension such as REQUIRE : 100rel. SIP messages usually contain information about extensions that aren't supported. If necessary, work with your SBC vendor to verify that the SBC is configured correctly to provide the required SIP protocol extension.
560420 420 Bad Extension
- Microsoft response code: 560420
- SIP response code: 420
- Suggested actions:
- Check the SBC configuration to make sure that it's configured to support the required headers, such as the Replaces header. If necessary, work with your SBC vendor to verify that the SBC is configured correctly to support the required SIP protocol extension.