Call Termination Reason Codes

UNALLOCATED NUMBER
(Because the SBC never generates this internally, this code originates at a switch downstream from this SBC.)

NO ROUTE TO DESTINATION

[Ribbon codes 138 and 139 are mapped to this ID. This mapping is performed before ISUP Release Message is sent. The "underlying" Ribbon code is placed into accounting record.]

(The SBC may release a call with this cause value if:

• No routes are configured on PSX for this destination.
• The PSX loses connectivity to PostgreSQL DB server and hence is unable to perform routing)

NO CIRCUIT AVAILABLE

[Ribbon codes 128, 140, and 142 are mapped to this ID. This mapping is performed before the ISUP Release Message is sent out. The "underlying" Ribbon code is placed into the accounting record.]

The SBC may release a call with this cause value if:

• The SBC attempts to initially route the call but none of the routes has any available circuits.
• SBC attempts to reroute call ("crankback"), but is out of routes or out of routes with available circuits. An attempt to reroute call may have various causes. When this is the result of an attempted reroute, the cause value triggering the reroute is placed into accounting record.
• A SBC software programming error occurred.

NETWORK OUT OF ORDER

The SBC may release a call with this cause value if:

• Gateway-to-Gateway Signaling Link to Far-End SBC is lost due to network problems or CLI command. In either event, all calls to that SBC are cleared with this disconnect reason.
• Gateway-to-Gateway Signaling Link to Far-End SBC went down and then back up. Afterwards, the SBCsaudit all calls between them. Any mismatched calls are brought down with this disconnect reason.

TEMPORARY FAILURE

[Ribbon codes 131, 132, and 136 are mapped to this ID. This mapping is performed before the ISUP Release Message is sent out. The "underlying" Ribbon code is placed into the accounting record.]

The SBC may release a call with this cause value if:

• Communication between SBC and PSX is broken and Policy Requests from the SBC to the PSX time out.
• A Policy Request issued from the SBC to the PSX was rejected by the PSX because of corrupted data in the packet - an indication of possible network problems.
• A SBC software programming error occurred.
• ISUP calls were brought down as a result ofcorrectiveaction that was performed following a Circuit Query with a Far-End PSTN Switch.
• Connectivity to SS7 Gateway is lost and all active SS7 Calls in the SBC are brought down.
• The SBC received a UCIC ISUP Message from a Far-End PSTN Switch that contained a CIC of an active SBC call.
• Call admission on SBC is suspended due to CNS Failure, switchover, standby card synchronization, no NTP time, or other issues. All new call admission requests from other SBCs over Gateway-to-Gateway signaling are released tooriginating gateway with this code.
• Catastrophic failure such as a CNS failure or a PNS failure occurs on a SBC and all affected calls are released. The SBC releases these calls back to the originating gateway over the gateway-to-gateway signaling link with this code.
• T8 Timer expires in ISUP. This timer expires ifSBC does not receive a COT message from previous switch within T8 Timer duration, when the IAM indicates that a COT is being performed.
  In general when SBC is not getting responses from PSX, this indicates IP network congestion or PSX overload. Both are transient conditions that will resolve themselves, hence the use of this code to indicate a temporary failure situation.

ACCESS INFORMATION DISCARDED
(The SBC may release a call with this cause value if this code is returned before an ANM/CONNECT message.)

INCOMING CALL BARRED CUG
(SBC may release a call with this cause value if this code is returned before an ANM/CONNECT message. CUG is CLOSED USER GROUP.)

NOT MEMBER OF CUG

(SBC may release a call with this cause value if this code is returned before an ANM/CONNECT message. CUG is CLOSED USER GROUP.)

RECOVERY ON TIMER EXPIRY(The SBC may release a call with this cause value if the internal SBC Call Establishment Timer expires. This interval is 5 minutes.)

PROTOCOL ERROR UNSPECIFIED[ISUP codes 96, 98, 100, and 101 are mapped to this ID.]

[nttfcc ISUP code 102 is mapped to this ID.]

The SBC may release a call with this cause value if:

• The PSX could not find routes to a destination because they were filtered out due to protocol conformance errors, according to the conventions cited in GR-317/394.
• A CAS Call Establishment error that is not configured to be handled in the SSP occurs, causing CAS to release the call with this code.
• Another error in a CAS SSP/SCP configuration that is being used by a call causes the call to be released with this code.

INTERWORKING UNSPECIFIED

The SBC may release a call with this cause value if:

• Incoming CAS call goes on-hook while being established and event not configured on SSP.
• Incoming CAS call goes on-hook after being established.
• Outgoing CAS call goes on-hook after being established.

RESOURCES ALLOCATION FAILURE[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release a call with this cause value if:

• No PSTN circuits are available to hunt.
• The DSP call resources are exhausted.
• Call admissions to system are suspended due toeventsuch as switchover, CNS switchover, etc.
• The SBC memory resources are exhausted.)

CHANNEL COLLISION BACKOFF[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if a call collision occurs on the selected egress circuit, resulting in backoff and reattempt of the call.)

INSUFFICIENT DESTINATION RESOURCES

[This Ribbon code is mapped to Q.931 ID 34.]

(SBC may release a call with this cause value if insufficient resources are available on destination gateway and rerouting is invoked to reattempt the call via a different route on the originating gateway.)

RESOURCE FAILURE

[This Ribbon code is mapped to Q.931 ID 41.]

(SBC may release a call with this cause value if a resource that was being used by the call fails and is no longer available. Taking a span out of service could cause this code.)

MODULE FAILURE

[This Ribbon code is mapped to Q.931 ID 41.]

(SBC may release a call with this cause value if a catastrophic failure causes bulk teardown of all calls on the module, and those calls are disconnected. A module failure, a module switchover, a span failure, an SGX that is temporarily placed into "PAUSED" state while calls are active, a SBC-to-SGX IP network failure resulting in loss of connectivity, etc. could cause this code.)

MEDIA GATEWAY SERVICE GROUP EGRESS DISCONNECT

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if an egress disconnect is indicated due to receipt of the MGCP DLCX message.)

CONTINUITY CHECK FAILED, BACKOFF

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if a continuity check on an egress circuit fails, resulting in backoff and reattempt of the call on a different circuit.)

COLLISION REATTEMPT EXHAUSTED

[This Ribbon code is mapped to Q.931 ID 41.]

(The SBC may release a call with this cause value if two consecutive collisions occur on the egress ISUP/ISDN/CAS circuit. For PSTN-PSTN calls, after one reattempt, or two collisions, the call is released with this code. For PSTN-IP-IP-PSTN calls, the call isreattempted using the next route in the list.)

CONTINUITY REATTEMPT EXHAUSTED

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if two consecutive continuity tests on the selected egress circuits fail. After one reattempt, the call is released with this code.)

NO ROUTE FOR BEARER CAPABILITY

[This Ribbon code is mapped to Q.931 ID 63.]

(SBC may release a call with this cause value if PSX routing lookup fails because no route with the Bearer Capability required for this call exists on PSX.)

NO ROUTE SIGNALING

[This Ribbon code is mapped to Q.931 ID 3.]

(SBC may release call with this cause value if PSX routing lookup fails because no route with signaling required for this call exists on PSX.)

NO ROUTE DIRECTION

[This Ribbon code is mapped to Q.931 ID 3.]

(SBC may release call with this cause value if PSX routing lookup fails because no route with direction required for this call exists on PSX.)

CIRCUIT ENDPOINT RESOURCE ALLOCATION FAILURE

[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release a call with this cause value if the circuit is released after being selected. Events such as a NIF being placed out of service or a port going into alarm may cause this code.)

DISCONNECT WITH NEW DESTINATION

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if the egress circuit is released while the ingress call is rerouted to a new destination, or the call is transferred.)

AUTOMATIC CONGESTION CONTROL PROCEDURE

[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release a call with this cause value if Automatic Congestion Control (ACC) is configured, insufficient resources are detected at the far end, and the call is cancelled. When ACC is active, calls may be rerouted or cancelled, depending on:

• current congestion level
• Alternate Route versus Direct Route requirements
• Percentage of calls to be rerouted versus cancelled
  This release code indicates that this call was cancelled, rather than rerouted.)

ACC ALTERNATE ROUTE

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if Automatic Congestion Control (ACC) is configured, insufficient resources are detected at the far end, and the call is rerouted. When ACC is active, calls may be rerouted or cancelled, depending on:

• current congestion level
• Alternate Route versus Direct Route requirements
• Percentage of calls to be rerouted versus cancelled
  This release code indicates that this call was rerouted, or reattempted on an alternate route.)

PACKET LOSS EXCEEDS THRESHOLD

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if RTCP disconnects the call because the measured packet loss within a specified timeframe exceeds a configured threshold. This timeframe, the RTCP Sender Report interval, and the threshold value are specified in the PSX Packet Service Profile.)

NO RTP OR RTCP PACKETS

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value if RTCP disconnects the call because no RTP or RTCP packets were received within the specified timeframe. This timeframe is two RTCP Sender Report intervals, as specified in the PSX Packet Service Profile. This absence of packets for this timeframe is "loss of RTP bearer channel".)

HOP COUNTER EXHAUSTED

[This Ribbon code is mapped to Q.931 ID 25.]

(The SBC may release a call with this cause value if the call was terminated because the ISUP hop counter was exhausted; not applicable to ISDN, H323, or SIP calls.)

CONVERSION FAILURE

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause value because the Gateway to Gateway Signaling protocol could not convert an MCS message.)

CPC_DISC_CONGESTION_REROUTE_NOT_PERMITTED

[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release calls that utilize the BT-IUP service with this cause value.)

CPC_DISC_SBC_INCOMPATIBLE_DESTINATION

[This Ribbon code is mapped to Q.931 ID 88.]

(The SBC may release a call with this cause code if the SBC version running on the destination Gateway is not compatible with the SBC version running on the originating Gateway.)

CPC_DISC_NO_PSX_ROUTES

[This Ribbon code is mapped to Q.931 ID 3.]

(The SBC may release a call with this cause code if a policy response from the PSX that contains routes is received with no routes.)

CPC_DISC_SETUP_REQ_TIMER_EXPIRY

[This Ribbon code is mapped to Q.931 ID 102.]

(The SBC may release a call with this cause code if there is a timer expiry on a setup request, for example no response by the peer to a SIP INVITE message on the egress call leg. This reason code is in the defaultcrankback profile, and will causecrankback on the next route returned by PSX for the destination.)

CPC_DISC_GW_CONGESTED

[This Ribbon code is mapped to Q.931 ID 42.]

(The remote SBC may release a gateway-to-gateway call with this cause code to indicate that gateway is congested. The local SBC will then skip any additional routes in the route list for that call that go to the congested gateway.)

CPC_DISC_GLARE_OCCURRED

[This Ribbon code is mapped to Q.931 ID 0.]

(The SBC may release a call with this cause code when GLARE prevents a call from setting up. Hence this cause code will populate the Call Disconnect Reason Field in an ATTEMPT record.)

CPC_DISC_NO_TERM_CIT_RCVD

[This Ribbon code is mapped to Q.931 ID 41.]

(The SBC may release a call with this cause code if the "Terminating carrier information" or "Terminating CA" parameter in SIP message is not received before Answer state. Based on IP signaling control flag "Disconnect If Neither Terminating CA Nor CIC Received.")

CPC_DISC_BUSY_EVERYWHERE

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a High Probability of Completion (HPC) call with this cause code to indicate that all routes have failed.)

CPC_DISC_REASON_UNKNOWN_RESOURCE_PRIORITY

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a High Probability of Completion (HPC) call with this cause code when a bad resource priority header (RPH) isrecieved in a SIP message.)

CPC_DISC_REASON_BAD_EXTENSION

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause code when the required SIP Extension is not supported.)

CPC_DISC_REASON_QUEUE_TIMEOUT

[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release a queued High Probability of Completion (HPC) call with this cause code if a queue timeout has occurred.)

CPC_DISC_REASON_FORBIDDEN

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release a call with this cause code if High Probability of Completion HPC treatment cannot be applied.)

CPC_DISC_REASON_QUEUEING_IMPOSSIBLE

[This Ribbon code is mapped to Q.931 ID 34.]

(The SBC may release a High Probability of Completion (HPC) call with this cause code because there are no available circuits and the call cannot be queued because queuing limits will be exceeded, or because queuing is not enabled.)

CPC_DISC_PDD_TIMER_EXPIRED

[This Ribbon code is mapped to Q.931 ID 42.]

(The SBC may release a call with this cause code if disconnect happens due to PDD Timer expiry in the ATTEMPT Record.)

CPC_DISC_ERROR_INFO_RLS

(The SBC may release a call with this cause code if there is an error in the release of the call while playing an announcement.)

CPC_DISC_TG_AUTH_FAIL

[This Ribbon code is mapped to Q.931 ID 31.]

(The SBC may release the call with this error code, if the request with credentials is rejected with non 401/407. This cause code is mapped to SIP error cause code of 403. This cause code can be configured to map to any SIP error cause.)

CPC_DISC_TG_AUTH_FAIL_401_407

[This Ribbon code is mapped to Q.931 ID 31.]

(If the request with credentials is rejected with non 401/407, the call is rejected with new internal cause code. This cause code can be mapped to any SIP error cause code. By default, it is mapped to SIP cause code 403. This cause code can be configured to map to any SIP error cause.)