| End Reason Code | End Reason Definition | 
|---|---|
| UNKNOWN | The call ended for an unknown reason. | 
| NO_RESOURCES | Needed server resources are not available. | 
| USER_INITIATED | User-initiated cancel/bye. | 
| UNAVAILABLE | The called party is not registered (timeout). | 
| SIGNED_OUT | The called party is not registered (signed out). | 
| NOT_RESPONDING | The called party did not respond to the invite. | 
| BUSY | The called party is busy on another call. | 
| LIST_NOT_SYNCED | Call to a list that is not in sync. | 
| GROUP_FULL | No more parties may join the group. | 
| NO_PRIVS | No privileges for call type (for example, broadcast). | 
| DND | The user's phone is on DND. | 
| CIRCUIT_CALL | Switched to circuit call. The user is on a voice call. | 
| CALL_DROPPED | The other party lost connection. | 
| CRYPTO_ERROR | Security Error. | 
| SILENT | The user's phone is in silent mode. | 
| USER_REJECT | The user rejected the alert call. | 
| NO_ANSWER | There was no answer to the alert call. | 
| OVERRIDE | Someone of higher priority initiated a call to the user. | 
| DUPLICATE_GROUP | Received an invite to a group, but call for that group is already in session. | 
| REMOVED_FROM_GROUP | Member has been removed from the group while in a group call. |