SIP Reference Guide
Table Of Contents
DNS Example
Elements and Architectures
Header Fields
Header Fields – Compact Forms
Header Parameters & Values
INVITE Client Transaction
INVITE Server Transaction
INVITE/200
Mapping Between SS7 USI and the SIP SDP (SS7 Origination)
Mapping Between the SIP SDP and SS7 USI/HLC (SIP Origination)
Mapping ISUP Cause Codes to SIP-I/SIP-T Responses
Mapping SIP-T Responses to ISUP Cause Codes
Mechanics: Location
Mechanics: Registration
Namespaces and Priority Values for the Resource Priority Header Field
NAPTR Records
Non-INVITE Client Transaction
Non-INVITE Server Transaction
Option Tags for SIP Extensions
Response Code
Security Mechanism Names
Session Description Protocol
SIP Events
SIP Methods
SIP Response to a Call Progress (CPG) Message
SIP Timers
SIP/SIPS URI Parameters
SIP-I Responses - ISUP Cause Codes
SIPS's Use of DNS
SRV Records
Types of DNS Resource Records
URI Purposes
Warning Codes
Glossary of SIP Acronyms
SIP References
   

Warning Codes


Other SIP Resources
 
SIP Pocket Guide
SIP Signaling Router Use Cases Multimedia
SIP Sessions Blog
SIP Signaling Router Application Handbook
SIP Signaling Router (SSR) Use Cases Application Guide
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RFC3261 Section 27.2

Note: Warning codes provide information supplemental to the status code in SIP response messages when the failure of the transaction results from a Session Description Protocol (SDP) problem.

Code Description
300 Incompatible network protocol: One or more network protocols contained in the session description are not available.
301 Incompatible network address formats: One or more network address formats contained in the session description are not available.
302 Incompatible transport protocol: One or more transport protocols described in the session description are not available.
303 Incompatible bandwidth units: One or more bandwidth measurement units contained in the session description were not understood.
304 Media type not available: One or more media types contained in the session description are not available.
305 Incompatible media format: One or more media formats contained in the session description are not available.
306 Attribute not understood: One or more of the media attributes in the session description are not supported.
307 Session description parameter not understood: A parameter other than those listed above was not understood.
330 Multicast not available: The site where the user is located does not support multicast.
331 Unicast is not available: The site where the user is located does not support unicast communication (usually due to the presence of a firewall).
370 Insufficient bandwidth: The bandwidth specified in the session description or defined by the media exceeds that known to be available.
399 Miscellaneous warning: The warning text can include arbitrary information to be presented to a human user or logged. A system receiving this warning MUST NOT take any automated action.
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