releaseCall

Usage

This operation is used by the gsmSCF to tear down an existing call at any phase of the call for all parties involved in the call.

Expected actions

• Upon the receipt of this operation, the gsmSCF will release the call in all directions with the cause indicator specified by the “cause” parameter.

Invoke parameters

• cause – the reason for releasing the call. This is a Q.850 cause. This has the following attributes:
  • coding with possible values
    • "CCITT"
    • "ISO/IEC"
    • "national"
    • "network specific"
  • location with possible values:
    • "U" - User
    • "LPN" - Private network serving the local user
    • "LN" - Public network serving the local user
    • "TN" - Transit network
    • "RLN" - Public network serving the remote user
    • "RPN" - Private network serving the remote user
    • "INTL - International network
    • "BI" - Network beyond the interworking point

Values for CCITT causes are:

• "normal-event"
• "unallocated" - Unallocated (unassigned) number
• "noroute-to-network" - No route to specified transit network
• "noroute" - No route to destination
• "send-info-tone" - Send special information tone
• "misdialed-trunk-prefix" - Misdialed trunk prefix
• "channel-unacceptable" - Channel unacceptable
• "call-delivered" - Call awarded and being delivered in an established channel
• "preemption" - Preemption
• "preemption-circuit-reserved" - Preemption circuit reserved for re-use
• "ported-number" - QoR: ported number Q.850 Addendum 1 (06/2000)
• "excess-digits" - Excess digits received, call is proceeding
• "normal-clearing" - Normal Clearing
• "busy" - User busy
• "noresponse" - No user responding
• "noanswer" - No answer from user (user alerted)
• "offline" - Subscriber absent
• "rejected" - Call Rejected
• "moved" - Number changed
• "redirection" - Redirection to new destination Q.850 05/98
• "rejected-by-feature" - Call rejected due to feature at the destination Q.850 Amendment 1 (07/2001)
• "looping" - Exchange routing error (hop counter) Q.850 05/98
• "answered" - Non-selected user clearing (answered elsewhere)
• "out-of-order" - Destination out of order
• "invalid-number" - Invalid number format
• "facility-rejected" - Facility rejected
• "status-enquiry-rsp" - Response to STATUS ENQUIRY
• "normal" - Normal, unspecified
• "resource-unavailable" - Resource unavailable
• "congestion" / "channel-congestion" - No circuit/channel available
• "net-out-of-order" - Network out of order
• "frame-mode-conn-down" - Permanent frame mode connection out of service
• "frame-mode-conn-up" - Permanent frame mode connection operational
• "temporary-failure" / "noconn"- Temporary failure
• "congestion" / "switch-congestion" - Switching equipment congestion
• "access-info-discarded" - Access information discarded
• "channel-unavailable" - Requested channel not available
• "preemption-congestion" - Precedence call blocked
• "noresource" - Resource unavailable, unspecified
• "service-unavailable" - Service or option not available
• "qos-unavailable" - Quality of service unavailable
• "facility-not-subscribed" - Requested facility not subscribed
• "forbidden-out" - Outgoing call barred within CUG
• "forbidden-in" - Incoming call barred within CUG
• "bearer-cap-not-auth" - Bearer capability not authorized
• "bearer-cap-not-available" / "nomedia" - Bearer capability not presently available
• "invalid-access-info-out" - Inconsistency in designated outgoing access information and subscriber class
• "service-unavailable" - Service or option not available
• "bearer-cap-not-implemented" - Bearer capability not implemented
• "channel-type-not-implemented" - Channel type not implemented
• "facility-not-implemented" - Requested facility not implemented
• "restrict-bearer-cap-avail" - Only restricted digital information bearer capability is available
• "service-not-implemented" - Service or option not implemented, unspecified
• "invalid-callref" - Invalid call reference value
• "unknown-channel" - Identified channel does not exist
• "unknown-callid" - A suspended call exists, but this call identity does not
• "duplicate-callid" - Call identity in use
• "no-call-suspended" - No call suspended
• "suspended-call-cleared" - Call having the requested call identity has been cleared
• "not-subscribed" - User not member of CUG
• "incompatible-dest" - Incompatible destination
• "unknown-group" - Non-existent CUG
• "invalid-transit-net" - Invalid transit network selection
• "invalid-message" - Invalid message, unspecified
• "missing-mandatory-ie" - Mandatory information element is missing
• "unknown-message" - Message type non-existent or not implemented
• "wrong-message" - Message not compatible with call state, non-existent or not implemented
• "unknown-ie" - Information element non-existent or not implemented
• "invalid-ie" - Invalid information element contents
• "wrong-state-message" - Message not compatible with call state
• "timeout" - Recovery on timer expiry
• "unknown-param-passed-on" - Parameter non-existent or not implemented, passed on
• "unknown-param-message-droppped" - Message with unrecognized parameter, discarded
• "protocol-error" - Protocol error, unspecified
• "interworking" - Interworking, unspecified

Result parameters

This operation does not expect a result.

Example

With decoded Q.850 cause:

<component localCID="1" type="Invoke" operationCode="releaseCall">
    <cause coding="CCITT" location="LN">
        noconn
    </cause>
</component>

Before introduction of Q.850 decoders, cause was an octet string:

<component localCID="1" type="Invoke" operationCode="releaseCall">
    <cause>69 35</cause>
</component>