Error Code Display-Text Description
10 VoIP not available Busy tone - SIP stack is not running -> no VoIP call possible
20 Invalid IP address Busy tone - Invalid IP dial info
30 VoIP config error: 0x30 Memory allocation failed
31 VoIP config error: 0x31 No entry for SIP Domain
33 VoIP config error: 0x33 No entry for SIP authentication name
34 VoIP config error: 0x34 No entry for SIP authentication password
300 VoIP status code:: 0x300 This status response is appropriate if the callee can be reached at several different locations and the server cannot or prefers not to proxy the request.
301 VoIP status code:: 0x301 The user can no longer be found at the address in the Request-URI, and the requesting client SHOULD retry at the new address given by the Contact header field. The requestor SHOULD update any local directories, address books, and user location caches with this new value and redirect future requests to the address(es) listed.
302 VoIP status code: 0x302 The requesting client SHOULD retry the request at the new address(es) given by the Contact header field. The Request-URI of the new request uses the value of the Contact header field in the response. The temporary URI may have become out-of-date sooner than the expiration time, and a new temporary URI may be available.
305 VoIP status code: 0x305 The requested resource MUST be accessed through the proxy given by the Contact field. The Contact field gives the URI of the proxy. The recipient is expected to repeat this single request via the proxy. 305 (Use Proxy) responses MUST only be generated by User Agent Servers (UASs).
380 VoIP status code: 0x380 The call was not successful, but alternative services are possible. The alternative services are described in the message body of the response. Formats for such bodies are not defined here, and may be the subject of future standardization.
400 VoIP status code: 0x400 The request could not be understood due to malformed syntax. The Reason-Phrase SHOULD identify the syntax problem in more detail, for example, "Missing Call-ID header field".
401 VoIP status code: 0x401 The request requires user authentication. This response is issued by User Agent Servers (UASs) and registrars, while 407 (Proxy Authentication Required) is used by proxy servers.
402 VoIP status code: 0x402 Reserved for future use.
403 VoIP status code: 0x403 The server understood the request, but is refusing to fulfill it. Authorization will not help, and the request SHOULD NOT be repeated.
404 VoIP status code: 0x404 The server has definitive information that the user does not exist at the domain specified in the Request-URI. This status is also returned if the domain in the Request-URI does not match any of the domains handled by the recipient of the request.
405 VoIP status code: 0x405 The method specified in the Request-Line is understood, but not allowed for the address identified by the Request-URI. The response MUST include an Allow header field containing a list of valid methods for the indicated address.
406 VoIP status code: 0x406 The resource identified by the request is only capable of generating response entities that have content characteristics not acceptable according to the Accept header field sent in the request.
407 VoIP status code: 0x407 This code is similar to 401 (Unauthorized), but indicates that the client MUST first authenticate itself with the proxy. This status code can be used for applications where access to the communication channel (for example, a telephony gateway) rather than the callee requires authentication.
408 VoIP status code: 0x408 The server could not produce a response within a suitable amount of time, for example, if it could not determine the location of the user in time. The client MAY repeat the request without modifications at any later time.
410 VoIP status code: 0x410 The requested resource is no longer available at the server and no forwarding address is known. This condition is expected to be considered permanent. If the server does not know, or has no facility to determine, whether or not the condition is permanent, the status code 404 (Not Found) SHOULD be used instead.
413 VoIP status code: 0x413 The server is refusing to process a request because the request entity-body is larger than the server is willing or able to process. The server MAY close the connection to prevent the client from continuing the request.
414 VoIP status code: 0x414 The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret.
415 VoIP status code: 0x415 The server is refusing to service the request because the message body of the request is in a format not supported by the server for the requested method. The server MUST return a list of acceptable formats using the Accept, Accept-Encoding, or Accept-Language header field, depending on the specific problem with the content.
416 VoIP status code: 0x416 The server cannot process the request because the scheme of the URI in the Request-URI is unknown to the server.
420 VoIP status code: 0x420 The server did not understand the protocol extension specified in a Proxy-Require or Require header field. The server MUST include a list of the unsupported extensions in an Unsupported header field in the response.
421 VoIP status code: 0x421 The User Agent Server (UAS) needs a particular extension to process the request, but this extension is not listed in a Supported header field in the request. Responses with this status code MUST contain a Require header field listing the required extensions.
423 VoIP status code: 0x423 The server is rejecting the request because the expiration time of the resource refreshed by the request is too short. This response can be used by a registrar to reject a registration whose Contact header field expiration time was too small.
480 VoIP status code: 0x480 The callee’s end system was contacted successfully but the callee is currently unavailable (for example, is not logged in, logged in but in a state that precludes communication with the callee, or has activated the "do not disturb" feature). The response MAY indicate a better time to call in the Retry-After header field. The user could also be available elsewhere (unbeknownst to this server). The reason phrase SHOULD indicate a more precise cause as to why the callee is unavailable. This value SHOULD be settable by the User Agent (UA).
This status is also returned by a redirect or proxy server that recognizes the user identified by the Request-URI, but does not currently have a valid forwarding location for that user.
481 VoIP status code: 0x481 This status indicates that the User Agent Server (UAS) received a request that does not match any existing dialog or transaction.
482 VoIP status code: 0x482 The server has detected a loop. An element MAY check for forwarding loops before forwarding a request.
483 VoIP status code: 0x483 The server received a request that contains a Max-Forwards header field with the value zero.
484 VoIP status code: 0x484 The server received a request with a Request-URI that was incomplete.
485 VoIP status code: 0x485 The Request-URI was ambiguous.
486 VoIP status code: 0x486 The callee’s end system was contacted successfully, but the callee is currently not willing or able to take additional calls at this end system.
487 VoIP status code: 0x487 The request was terminated by a BYE or CANCEL request.
488 VoIP status code: 0x488 The response has the same meaning as 606 (Not Acceptable), but only applies to the specific resource addressed by the Request-URI and the request may succeed elsewhere.
491 VoIP status code: 0x491 The request was received by a User Agent Server (UAS) that had a pending request within the same dialog.
493 VoIP status code: 0x493 The request was received by a User Agent Server (UAS) that contained an encrypted MIME body for which the recipient does not possess or will not provide an appropriate decryption key.
500 VoIP status code: 0x500 The server encountered an unexpected condition that prevented it from fulfilling the request.
501 VoIP status code: 0x501 The server does not support the functionality required to fulfill the request. This is the appropriate response when a User Agent Server (UAS) does not recognize the request method and is not capable of supporting it for any user.
502 VoIP status code: 0x502 The server, while acting as a gateway or proxy, received an invalid response from the downstream server it accessed in attempting to fulfill the request.
503 VoIP status code: 0x503 The server is temporarily unable to process the request due to a temporary overloading or maintenance of the server.
504 VoIP status code: 0x504 The server did not receive a timely response from an external server it accessed in attempting to process the request.
505 VoIP status code: 0x505 The server does not support, or refuses to support, the SIP protocol version that was used in the request. The server is indicating that it is unable or unwilling to complete the request using the same major version as the client, other than with this error message.
513 VoIP status code: 0x515 The server was unable to process the request since the message length exceeded its capabilities.
600 VoIP status code: 0x600 The callee’s end system was contacted successfully but the callee is busy and does not wish to take the call at this time.
603 VoIP status code: 0x603 The callee’s machine was successfully contacted but the user explicitly does not wish to or cannot participate.
604 VoIP status code: 0x604 The server has authoritative information that the user indicated in the Request-URI does not exist anywhere.
606 VoIP status code: 0x606 The user’s agent was contacted successfully but some aspects of the session description such as the requested media, bandwidth, or addressing style were not acceptable.
701 VoIP status code: 0x701 Release Reason: Bye received => disconnect from the remote party
703 VoIP status code: 0x703 Release Reason: sip timeout => LINE disconnect
general request timeout
704 VoIP status code: 0x704 Release Reason: sip error => LINE disconnect
general internal error
705 VoIP status code: 0x705 Release Reason: out of memory=> "wrong dialing tone"
Memory allocation failure
706 VoIP status code: 0x706 can't get a transaction
751 VoIP status code: 0x751 Codec negotiation between caller and callee failed
810 VoIP status code: 0x810 General socket layer error: user of socket not authorized
811 VoIP status code: 0x811 General socket layer error: used socket number is not valid
812 VoIP status code: 0x812 General socket layer error: socket is not connected
813 VoIP status code: 0x813 General socket layer error: memory error on socket layer
814 VoIP status code: 0x814 General socket layer error: socket is not reachable
815 VoIP status code: 0x815 General socket layer error: illegal operation on the socket interface
 

IP registration missing

- System start up is not finished
- IP network is not working (Ethernet connection not available)
- STUN has not determined the type of NAT
- SIP stack is running but registration data is missing
- SIP registration is invalid