Understanding the different call statuses

Call StatusDefinitionRemarks
CompletedCall is answeredYou will also find a positive integer for the call duration and this call will be charged
Completed with FailureCall is answered but some error occuredYou will also find a positive integer for the call duration but the call was ended due to some failure on the network
No Answer or Not AnsweredCall was not answered despite ringingNo call duration will be present.
BusyCall was declined by the receiverNo call duration will be present.
Rejected or CancelledCall was cancelled by UnifonicThis could be due to some business rules on security policy or acceptable term of use. i.e. call was made outside of business hours
FailedCall was not attempted by the operatorThis could be due to the following reasons:
i. invalid e.164 string
ii. unreachable recipient
iii. network error
iv. network congestion
v. inaccurate call status submitted by operator (more common for international calls)
QueuedCall is being processed This could be due to congestion on the network due to insufficient or unavailable sip channels