| RTC_S_ROAMING_NOT_SUPPORTED | 0x00EE0041 | Server does not support this type of roaming |
| RTC_E_STATUS_INFO_TRYING | 0x00EF0064 | Trying |
| RTC_E_STATUS_INFO_RINGING | 0x00EF00B4 | Ringing |
| RTC_E_STATUS_INFO_CALL_FORWARDING | 0x00EF00B5 | Call Is Being Forwarded |
| RTC_E_STATUS_INFO_QUEUED | 0x00EF00B6 | Queued |
| RTC_E_STATUS_SESSION_PROGRESS | 0x00EF00B7 | Session Progress |
| RTC_E_STATUS_SUCCESS | 0x00EF00C8 | OK |
| RTC_E_SIP_CODECS_DO_NOT_MATCH | 0x80EE0000 | No matching codecs with peer |
| RTC_E_SIP_STREAM_PRESENT | 0x80EE0001 | Parsing SIP failed
The stream to be started is already present |
| RTC_E_SIP_STREAM_NOT_PRESENT | 0x80EE0002 | The stream to be stopped is not present |
| RTC_E_SIP_NO_STREAM | 0x80EE0003 | No stream is active |
| RTC_E_SIP_PARSE_FAILED | 0x80EE0004 | Parsing SIP failed |
| RTC_E_SIP_HEADER_NOT_PRESENT | 0x80EE0005 | The SIP header is not present in the message |
| RTC_E_SDP_NOT_PRESENT | 0x80EE0006 | SDP is not present in the SIP message |
| RTC_E_SDP_PARSE_FAILED | 0x80EE0007 | Parsing SDP failed |
| RTC_E_SDP_UPDATE_FAILED | 0x80EE0008 | SDP does not match the previous one |
| RTC_E_SDP_MULTICAST | 0x80EE0009 | Multicast is not supported |
| RTC_E_SDP_CONNECTION_ADDR | 0x80EE000A | Media does not contain connection address |
| RTC_E_SDP_NO_MEDIA | 0x80EE000B | No media is available for the session |
| RTC_E_SIP_TIMEOUT | 0x80EE000C | SIP Transaction timed out |
| RTC_E_SDP_FAILED_TO_BUILD | 0x80EE000D | Failed to build SDP blob |
| RTC_E_SIP_INVITE_TRANSACTION_PENDING | 0x80EE000E | Currently processing another INVITE transaction |
| RTC_E_SIP_AUTH_HEADER_SENT | 0x80EE000F | Authorization header was sent in a previous request |
| RTC_E_SIP_AUTH_TYPE_NOT_SUPPORTED | 0x80EE0010 | The Authentication type requested is not supported |
| RTC_E_SIP_AUTH_FAILED | 0x80EE0011 | Authentication Failed |
| RTC_E_INVALID_SIP_URL | 0x80EE0012 | The SIP URL is not valid |
| RTC_E_DESTINATION_ADDRESS_LOCAL | 0x80EE0013 | The Destination Address belongs to the local machine |
| RTC_E_INVALID_ADDRESS_LOCAL | 0x80EE0014 | The Local Address is invalid, check the profile |
| RTC_E_DESTINATION_ADDRESS_MULTICAST | 0x80EE0015 | The Destination Address is a multicast address |
| RTC_E_INVALID_PROXY_ADDRESS | 0x80EE0016 | The Proxy Address is not valid |
| RTC_E_SIP_TRANSPORT_NOT_SUPPORTED | 0x80EE0017 | The Transport specified is not supported |
| RTC_E_SIP_NEED_MORE_DATA | 0x80EE0018 | Need more data for parsing a whole SIP message |
| RTC_E_SIP_CALL_DISCONNECTED | 0x80EE0019 | The Call has been disconnected |
| RTC_E_SIP_REQUEST_DESTINATION_ADDR_NOT_PRESENT | 0x80EE001A | The Request destination address is not known |
| RTC_E_SIP_UDP_SIZE_EXCEEDED | 0x80EE001B | The sip message size is greater than the UDP message size allowed |
| RTC_E_SIP_SSL_TUNNEL_FAILED | 0x80EE001C | Cannot establish SSL tunnel to Http proxy |
| RTC_E_SIP_SSL_NEGOTIATION_TIMEOUT | 0x80EE001D | Timeout during SSL Negotiation |
| RTC_E_SIP_STACK_SHUTDOWN | 0x80EE001E | Sip Stack is already shutdown |
| RTC_E_MEDIA_CONTROLLER_STATE | 0x80EE001F | Operation not allowed in current media controller state |
| RTC_E_MEDIA_NEED_TERMINAL | 0x80EE0020 | Can not find device |
| RTC_E_MEDIA_AUDIO_DEVICE_NOT_AVAILABLE | 0x80EE0021 | Audio device is not available |
| RTC_E_MEDIA_VIDEO_DEVICE_NOT_AVAILABLE | 0x80EE0022 | Video device is not available |
| RTC_E_START_STREAM | 0x80EE0023 | Can not start stream |
| RTC_E_MEDIA_AEC | 0x80EE0024 | Failed to enable acoustic echo cancellation |
| RTC_E_CLIENT_NOT_INITIALIZED | 0x80EE0025 | Client not initialized |
| RTC_E_CLIENT_ALREADY_INITIALIZED | 0x80EE0026 | Client already initialized |
| RTC_E_CLIENT_ALREADY_SHUT_DOWN | 0x80EE0027 | Client already shut down |
| RTC_E_PRESENCE_NOT_ENABLED | 0x80EE0028 | Presence not enabled |
| RTC_E_INVALID_SESSION_TYPE | 0x80EE0029 | Invalid session type |
| RTC_E_INVALID_SESSION_STATE | 0x80EE002A | Invalid session state |
| RTC_E_NO_PROFILE | 0x80EE002B | No valid profile for this operation |
| RTC_E_LOCAL_PHONE_NEEDED | 0x80EE002C | A local phone number is needed |
| RTC_E_NO_DEVICE | 0x80EE002D | No preferred device |
| RTC_E_INVALID_PROFILE | 0x80EE002E | Invalid profile |
| RTC_E_PROFILE_NO_PROVISION | 0x80EE002F | No provision tag in profile |
| RTC_E_PROFILE_NO_KEY | 0x80EE0030 | No profile key |
| RTC_E_PROFILE_NO_NAME | 0x80EE0031 | No profile name |
| RTC_E_PROFILE_NO_USER | 0x80EE0032 | No user tag in profile |
| RTC_E_PROFILE_NO_USER_URI | 0x80EE0033 | No user URI in profile |
| RTC_E_PROFILE_NO_SERVER | 0x80EE0034 | No server tag in profile |
| RTC_E_PROFILE_NO_SERVER_ADDRESS | 0x80EE0035 | Server tag missing address in profile |
| RTC_E_PROFILE_NO_SERVER_PROTOCOL | 0x80EE0036 | Server tag missing protocol in profile |
| RTC_E_PROFILE_INVALID_SERVER_PROTOCOL | 0x80EE0037 | Invalid server protocol in profile |
| RTC_E_PROFILE_INVALID_SERVER_AUTHMETHOD | 0x80EE0038 | Invalid server authentication method in profile |
| RTC_E_PROFILE_INVALID_SERVER_ROLE | 0x80EE0039 | Invalid server role in profile |
| RTC_E_PROFILE_MULTIPLE_REGISTRARS | 0x80EE003A | Multiple registrar servers in profile |
| RTC_E_PROFILE_INVALID_SESSION | 0x80EE003B | Invalid session tag in profile |
| RTC_E_PROFILE_INVALID_SESSION_PARTY | 0x80EE003C | Invalid session party in profile |
| RTC_E_PROFILE_INVALID_SESSION_TYPE | 0x80EE003D | Invalid session type in profile |
| RTC_E_OPERATION_WITH_TOO_MANY_PARTICIPANTS | 0x80EE003E | The operation failed because of too many participants in the session |
| RTC_E_BASIC_AUTH_SET_TLS | 0x80EE003F | Must set transport to TLS if Basic Auth is allowed |
| RTC_E_SIP_HIGH_SECURITY_SET_TLS | 0x80EE0040 | Must set transport to TLS if high security mode is needed |
| RTC_E_PROFILE_SERVER_UNAUTHORIZED | 0x80EE0042 | Server address does not match an authorized domain in profile |
| RTC_E_DUPLICATE_REALM | 0x80EE0043 | Duplicate realm exists in an enabled profile |
| RTC_E_POLICY_NOT_ALLOW | 0x80EE0044 | Current policy settings do not allow this action |
| RTC_E_PORT_MAPPING_UNAVAILABLE | 0x80EE0045 | Port mapping can not be obtained from the port manager |
| RTC_E_PORT_MAPPING_FAILED | 0x80EE0046 | Port mapping failure returned from the port manager |
| RTC_E_SECURITY_LEVEL_NOT_COMPATIBLE | 0x80EE0047 | The local and remote security levels are not compatible. |
| RTC_E_SECURITY_LEVEL_NOT_DEFINED | 0x80EE0048 | The security level is not defined |
| RTC_E_SECURITY_LEVEL_NOT_SUPPORTED_BY_PARTICIPANT | 0x80EE0049 | Participant could not support the requested security level |
| RTC_E_DUPLICATE_BUDDY | 0x80EE004A | Buddy already exists |
| RTC_E_DUPLICATE_WATCHER | 0x80EE004B | Watcher already exists |
| RTC_E_MALFORMED_XML | 0x80EE004C | Malformed XML |
| RTC_E_ROAMING_OPERATION_INTERRUPTED | 0x80EE004D | Roaming operation interrupted. It may succeed or fail. |
| RTC_E_ROAMING_FAILED | 0x80EE004E | Roaming session failed |
| RTC_E_INVALID_BUDDY_LIST | 0x80EE004F | Buddy list is invalid |
| RTC_E_INVALID_ACL_LIST | 0x80EE0050 | ACL list is invalid |
| RTC_E_NO_GROUP | 0x80EE0051 | Group does not exist |
| RTC_E_DUPLICATE_GROUP | 0x80EE0052 | Group already exists |
| RTC_E_TOO_MANY_GROUPS | 0x80EE0053 | Max number of groups has been reached |
| RTC_E_NO_BUDDY | 0x80EE0054 | Buddy does not exist |
| RTC_E_NO_WATCHER | 0x80EE0055 | Watcher does not exist |
| RTC_E_NO_REALM | 0x80EE0056 | No realm is set |
| RTC_E_NO_TRANSPORT | 0x80EE0057 | Server can not be specified without a transport protocol |
| RTC_E_NOT_EXIST | 0x80EE0058 | The required item does not exist |
| RTC_E_INVALID_PREFERENCE_LIST | 0x80EE0059 | Preference list is invalid |
| RTC_E_MAX_PENDING_OPERATIONS | 0x80EE005A | Maximum number of pending operations reached |
| RTC_E_TOO_MANY_RETRIES | 0x80EE005B | Too many attempts to resend a request |
| RTC_E_INVALID_PORTRANGE | 0x80EE005C | Invalid port range |
| RTC_E_SIP_CALL_CONNECTION_NOT_ESTABLISHED | 0x80EE005D | Call connection has not been established |
| RTC_E_SIP_ADDITIONAL_PARTY_IN_TWO_PARTY_SESSION | 0x80EE005E | Adding additional parties to two party session failed |
| RTC_E_SIP_PARTY_ALREADY_IN_SESSION | 0x80EE005F | Party already exists in session |
| RTC_E_SIP_OTHER_PARTY_JOIN_IN_PROGRESS | 0x80EE0060 | Join operation is in progress for another party |
| RTC_E_INVALID_OBJECT_STATE | 0x80EE0061 | Object state does not allow to perform this operation |
| RTC_E_PRESENCE_ENABLED | 0x80EE0062 | Presence is enabled |
| RTC_E_ROAMING_ENABLED | 0x80EE0063 | Roaming is enabled |
| RTC_E_SIP_TLS_INCOMPATIBLE_ENCRYPTION | 0x80EE0064 | Incompatible TLS encryption |
| RTC_E_SIP_INVALID_CERTIFICATE | 0x80EE0065 | Invalid certificate |
| RTC_E_SIP_DNS_FAIL | 0x80EE0066 | DNS lookup fails |
| RTC_E_SIP_TCP_FAIL | 0x80EE0067 | Fails to make a TCP connection |
| RTC_E_TOO_SMALL_EXPIRES_VALUE | 0x80EE0068 | Expires value received from the server is too small |
| RTC_E_SIP_TLS_FAIL | 0x80EE0069 | Fails to make a TLS connection |
| RTC_E_NOT_PRESENCE_PROFILE | 0x80EE006A | A presence profile must be used |
| RTC_E_SIP_INVITEE_PARTY_TIMEOUT | 0x80EE006B | Invitee connection fails |
| RTC_E_SIP_AUTH_TIME_SKEW | 0x80EE006C | Authentication failure because of time skew between client and server |
| RTC_E_INVALID_REGISTRATION_STATE | 0x80EE006D | Invalid registration state |
| RTC_E_MEDIA_DISABLED | 0x80EE006E | Media is disabled |
| RTC_E_MEDIA_ENABLED | 0x80EE006F | Media is enabled |
| RTC_E_REFER_NOT_ACCEPTED | 0x80EE0070 | Refer has not been accepted |
| RTC_E_REFER_NOT_ALLOWED | 0x80EE0071 | Refer operation is not allowed in this session |
| RTC_E_REFER_NOT_EXIST | 0x80EE0072 | Refer session does not exist or has finished |
| RTC_E_SIP_HOLD_OPERATION_PENDING | 0x80EE0073 | Currently an hold operation is pending |
| RTC_E_SIP_UNHOLD_OPERATION_PENDING | 0x80EE0074 | Currently an unhold operation is pending |
| RTC_E_MEDIA_SESSION_NOT_EXIST | 0x80EE0075 | Media session does not exist |
| RTC_E_MEDIA_SESSION_IN_HOLD | 0x80EE0076 | Media session is in hold |
| RTC_E_ANOTHER_MEDIA_SESSION_ACTIVE | 0x80EE0077 | Another media session is active |
| RTC_E_MAX_REDIRECTS | 0x80EE0078 | Too many redirects |
| RTC_E_REDIRECT_PROCESSING_FAILED | 0x80EE0079 | Processing redirect failed |
| RTC_E_LISTENING_SOCKET_NOT_EXIST | 0x80EE007A | Listening socket does not exist |
| RTC_E_INVALID_LISTEN_SOCKET | 0x80EE007B | Specified address and port is invalid |
| RTC_E_PORT_MANAGER_ALREADY_SET | 0x80EE007C | Port manager already set |
| RTC_E_SECURITY_LEVEL_ALREADY_SET | 0x80EE007D | The security level has already been set for this Media type can and can not be changed |
| RTC_E_UDP_NOT_SUPPORTED | 0x80EE007E | This feature is not supported when one of the server in profile has UDP transport |
| RTC_E_SIP_REFER_OPERATION_PENDING | 0x80EE007F | Currently a refer operation is pending |
| RTC_E_PLATFORM_NOT_SUPPORTED | 0x80EE0080 | This operation is not supported on this Windows Platform. |
| RTC_E_SIP_PEER_PARTICIPANT_IN_MULTIPARTY_SESSION | 0x80EE0081 | A peer participant cannot be added to a multiparty session |
| RTC_E_NOT_ALLOWED | 0x80EE0082 | This action is not allowed |
| RTC_E_REGISTRATION_DEACTIVATED | 0x80EE0083 | The user is being moved |
| RTC_E_REGISTRATION_REJECTED | 0x80EE0084 | The user's account was disabled or deleted or the SIP URI changed |
| RTC_E_REGISTRATION_UNREGISTERED | 0x80EE0085 | The user was logged out because the user logged in elsewhere |
| RTC_E_STATUS_REDIRECT_MULTIPLE_CHOICES | 0x80EF012C | Multiple Choices |
| RTC_E_STATUS_REDIRECT_MOVED_PERMANENTLY | 0x80EF012D | Moved Permanently |
| RTC_E_STATUS_REDIRECT_MOVED_TEMPORARILY | 0x80EF012E | Moved Temporarily |
| RTC_E_STATUS_REDIRECT_SEE_OTHER | 0x80EF012F | See Other |
| RTC_E_STATUS_REDIRECT_USE_PROXY | 0x80EF0131 | Use Proxy |
| RTC_E_STATUS_REDIRECT_ALTERNATIVE_SERVICE | 0x80EF017C | Alternative Service |
| RTC_E_STATUS_CLIENT_BAD_REQUEST | 0x80EF0190 | Bad Request |
| RTC_E_STATUS_CLIENT_UNAUTHORIZED | 0x80EF0191 | Unauthorized |
| RTC_E_STATUS_CLIENT_PAYMENT_REQUIRED | 0x80EF0192 | Payment Required |
| RTC_E_STATUS_CLIENT_FORBIDDEN | 0x80EF0193 | Forbidden |
| RTC_E_STATUS_CLIENT_NOT_FOUND | 0x80EF0194 | Not Found |
| RTC_E_STATUS_CLIENT_METHOD_NOT_ALLOWED | 0x80EF0195 | Method Not Allowed |
| RTC_E_STATUS_CLIENT_NOT_ACCEPTABLE | 0x80EF0196 | Not Acceptable |
| RTC_E_STATUS_CLIENT_PROXY_AUTHENTICATION_REQUIRED | 0x80EF0197 | Proxy Authentication Required |
| RTC_E_STATUS_CLIENT_REQUEST_TIMEOUT | 0x80EF0198 | Request Timeout |
| RTC_E_STATUS_CLIENT_CONFLICT | 0x80EF0199 | Conflict |
| RTC_E_STATUS_CLIENT_GONE | 0x80EF019A | Gone |
| RTC_E_STATUS_CLIENT_LENGTH_REQUIRED | 0x80EF019B | Length Required |
| RTC_E_STATUS_CLIENT_REQUEST_ENTITY_TOO_LARGE | 0x80EF019D | Request Entity Too Large |
| RTC_E_STATUS_CLIENT_REQUEST_URI_TOO_LARGE | 0x80EF019E | Request-URI Too Long |
| RTC_E_STATUS_CLIENT_UNSUPPORTED_MEDIA_TYPE | 0x80EF019F | Unsupported Media Type |
| RTC_E_STATUS_CLIENT_BAD_EXTENSION | 0x80EF01A4 | Bad Extension |
| RTC_E_STATUS_CLIENT_TEMPORARILY_NOT_AVAILABLE | 0x80EF01E0 | Temporarily Unavailable |
| RTC_E_STATUS_CLIENT_TRANSACTION_DOES_NOT_EXIST | 0x80EF01E1 | Call Leg/Transaction Does Not Exist |
| RTC_E_STATUS_CLIENT_LOOP_DETECTED | 0x80EF01E2 | Loop Detected |
| RTC_E_STATUS_CLIENT_TOO_MANY_HOPS | 0x80EF01E3 | Too Many Hops |
| RTC_E_STATUS_CLIENT_ADDRESS_INCOMPLETE | 0x80EF01E4 | Address Incomplete |
| RTC_E_STATUS_CLIENT_AMBIGUOUS | 0x80EF01E5 | Ambiguous |
| RTC_E_STATUS_CLIENT_BUSY_HERE | 0x80EF01E6 | Busy Here |
| RTC_E_STATUS_REQUEST_TERMINATED | 0x80EF01E7 | Request Terminated |
| RTC_E_STATUS_NOT_ACCEPTABLE_HERE | 0x80EF01E8 | Not Acceptable Here |
| RTC_E_STATUS_SERVER_INTERNAL_ERROR | 0x80EF01F4 | Server Internal Error |
| RTC_E_STATUS_SERVER_NOT_IMPLEMENTED | 0x80EF01F5 | Not Implemented |
| RTC_E_STATUS_SERVER_BAD_GATEWAY | 0x80EF01F6 | Bad Gateway |
| RTC_E_STATUS_SERVER_SERVICE_UNAVAILABLE | 0x80EF01F7 | Service Unavailable |
| RTC_E_STATUS_SERVER_SERVER_TIMEOUT | 0x80EF01F8 | Server Time-out |
| RTC_E_STATUS_SERVER_VERSION_NOT_SUPPORTED | 0x80EF01F9 | Version Not Supported |
| RTC_E_STATUS_GLOBAL_BUSY_EVERYWHERE | 0x80EF0258 | Busy Everywhere |
| RTC_E_STATUS_GLOBAL_DECLINE | 0x80EF025B | Decline |
| RTC_E_STATUS_GLOBAL_DOES_NOT_EXIST_ANYWHERE | 0x80EF025C | Does Not Exist Anywhere |
| RTC_E_STATUS_GLOBAL_NOT_ACCEPTABLE | 0x80EF025E | Not Acceptable |
| RTC_E_PINT_STATUS_REJECTED_BUSY | 0x80F00005 | Busy |
| RTC_E_PINT_STATUS_REJECTED_NO_ANSWER | 0x80F00006 | No Answer |
| RTC_E_PINT_STATUS_REJECTED_ALL_BUSY | 0x80F00007 | All Busy |
| RTC_E_PINT_STATUS_REJECTED_PL_FAILED | 0x80F00008 | Primary Leg Failed |
| RTC_E_PINT_STATUS_REJECTED_SW_FAILED | 0x80F00009 | Switch Failed |
| RTC_E_PINT_STATUS_REJECTED_CANCELLED | 0x80F0000A | Cancelled |
| RTC_E_PINT_STATUS_REJECTED_BADNUMBER | 0x80F0000B | Bad Number |