300 - Received SIP 400 bad request;waiting for INVITE response
301 - Received SIP 400 bad request;waiting for INVITE response
302 - Received SIP 404 not found; call failed; called party does not exist
303 - Received SIP 415 unsupported media type; call failed; called party does not support media
304 - Received SIP 480 temporarily unavailable; call failed; called party is not in the LTE area
305 - No network response; call failed
306 - No network response; unable to put call on hold
307 - Moved to eHRPD; call failed or dropped; not in the LTE area
308 - Upgrade/downgrade rejected (200 OK with the current call SDP)
309 - Received 403 call forbidden;waiting for INVITE response
310 - Generic timeout; did not receive a response from the server or other end
311 - Reported on the MO side for generic internal software errors; user can try again if the call still exists
312 - Reported on the MT side if the upgrade timer has been cancelled or cannot complete the request for some reason after notifying the user of a reinvite request
313 - Call origination is rejected due to a Service-Specific Access Control (SSAC) barring