SIP Status Codes

SIP Status Code

Error Code	Error Message	Description
400	Bad Request	Error 400 indicates that the request from the device is incomplete or malformed (e.g., due to a malfunction or misconfiguration of the device).
401	Unauthorized	Status message "401 Unauthorized" is the normal authentication step in SIP.
403	Forbidden	Error 403 indicates that no routing is possible, e.g., because an unsupported number is being dialed.
403	Authorization failure	Registration at the SIP server fails authentication – in most cases this is caused by an incorrect VoIP password or user ID in the device.
404	Not Found	Error 404 indicates that the dialed number does not exist or was not found in the PBX of the destination.
480	Temporarily Unavailable	Error 480 indicates that the called party is currently unavailable.
481	Call/Transaction Does Not Exist	Error 481 indicates that the request could not be associated with an active connection – in most cases the problem lies with the device.
482	Loop Detected	Error 482 indicates that an endless loop due to forwarding has been detected. The server terminates the call.
483	Too Many Hops	Error 483 indicates that too many SIP hops were traversed.
484	Address Incomplete	Error 484 indicates that the dialed number is incomplete.
486	Busy Here	Error 486 indicates that the called subscriber line is busy. Depending on the destination system, this status message is also sent when the caller number is on a block list.
487	Request Terminated	Error 487 indicates that the caller disconnected before the call was answered by the recipient.
488	Not Acceptable Here	Error 488 indicates that the other party cannot accept the call because the transmitted call parameters (e.g., Codecs) are not supported by the other party. The call fails at this destination but may succeed at another.
503	Service Unavailable	Error 503 indicates that the server or gateway is unable to process the request. This is usually caused by overload or maintenance issues.

What does "403 Authorization failure" mean on my SIP phone?

This error message appears when the device cannot authenticate with the SIP server. In most cases, the cause is an incorrect VoIP password or user ID stored in the device.

The VoIP password must not be confused with the login password for the customer portal. It is recommended to copy and paste the VoIP password into the device settings to avoid input errors.

note

You can find the required VoIP password in the customer portal under "Phone numbers" -> "Phone number overview" by clicking on the desired number (within the "SIP-Data" card).

Message "This call is not covered by your tariff plan"

The error message "This call is not covered by your tariff plan" may be due to the following reasons:

1. The account does not have enough credit for the desired call. In this case, a top-up is required.
2. The dialed number was entered in an unsupported format. Valid formats are e.g. 032xxxxxxx / 004132xxxxxxx / +4132xxxxxxx for national calls or 004132xxxxxxx as well as +4132xxxxxxx for international calls.
3. The dialed number is not supported by sipcall. International service numbers and premium-rate numbers are generally excluded.