现象描述：很多时候解码出来的释放或失败原因都是代码，需要到具体原因描述。
解决方法：协议中有此代码，整理如下。
经验总结：无线相关的原因列表
Cause ::= CHOICE {
radioNetwork CauseRadioNetwork,
transmissionNetwork CauseTransmissionNetwork,
nAS CauseNAS,
protocol CauseProtocol,
misc CauseMisc,
non-Standard CauseNon-Standard,
...,
radioNetworkExtension CauseRadioNetworkExtension
}
CauseRadioNetwork ::= INTEGER {
rab-pre-empted (1),
trelocoverall-expiry (2),
trelocprep-expiry (3),
treloccomplete-expiry (4),
tqueing-expiry (5),
relocation-triggered (6),
trellocalloc-expiry(7),
unable-to-establish-during-relocation (8),
unknown-target-rnc (9),
relocation-cancelled (10),
successful-relocation (11),
requested-ciphering-and-or-integrity-protection-algorithms-not-supported (12),
conflict-with-already-existing-integrity-protection-and-or-ciphering-information (13),
failure-in-the-radio-interface-procedure (14),无线网络受限制或无连接
release-due-to-utran-generated-reason (15),
user-inactivity (16),
time-critical-relocation (17),
requested-traffic-class-not-available (18),
invalid-rab-parameters-value (19),
requested-maximum-bit-rate-not-available (20),
requested-guaranteed-bit-rate-not-available (21),
requested-transfer-delay-not-achievable (22),
invalid-rab-parameters-combination (23),
condition-violation-for-sdu-parameters (24),
condition-violation-for-traffic-handling-priority (25),
condition-violation-for-guaranteed-bit-rate (26),
user-plane-versions-not-supported (27),
iu-up-failure (28),
relocation-failure-in-target-CN-RNC-or-target-system(29),
invalid-RAB-ID (30),
no-remaining-rab (31),
interaction-with-other-procedure (32),
requested-maximum-bit-rate-for-dl-not-available (33),
requested-maximum-bit-rate-for-ul-not-available (34),
requested-guaranteed-bit-rate-for-dl-not-available (35),
requested-guaranteed-bit-rate-for-ul-not-available (36),
repeated-integrity-checking-failure (37),
requested-request-type-not-supported (38),
request-superseded (39),
release-due-to-UE-generated-signalling-connection-release (40),
resource-optimisation-relocation (41),
requested-information-not-available (42),
relocation-desirable-for-radio-reasons (43),
relocation-not-supported-in-target-RNC-or-target-system (44),
directed-retry (45),
radio-connection-with-UE-Lost (46),
rNC-unable-to-establish-all-RFCs (47),
deciphering-keys-not-available(48),
dedicated-assistance-data-not-available(49),
relocation-target-not-allowed (50),
location-reporting-congestion (51),
reduce-load-in-serving-cell (52),
no-radio-resources-available-in-target-cell (53),
gERAN-Iumode-failure (54),
access-restricted-due-to-shared-networks (55),
incoming-relocation-not-supported-due-to-PUESBINE-feature (56),
traffic-load-in-the-target-cell-higher-than-in-the-source-cell (57),
mBMS-no-multicast-service-for-this-UE(58),
mBMS-unknown-UE-ID(59),
successful-MBMS-session-start-no-data-bearer-necessary(60),
mBMS-superseded-due-to-NNSF(61),
mBMS-UE-linking-already-done(62),
mBMS-UE-de-linking-failure-no-existing-UE-linking(63),
tMGI-unknown(64)
} (1..64)
CauseTransmissionNetwork ::= INTEGER {
signalling-transport-resource-failure (65),
iu-transport-connection-failed-to-establish (66)
} (65..80)
CauseNAS ::= INTEGER {
user-restriction-start-indication (81),
user-restriction-end-indication (82),
normal-release (83)
} (81..96)
CauseProtocol ::= INTEGER {
transfer-syntax-error (97),
semantic-error (98),
message-not-compatible-with-receiver-state (99),
abstract-syntax-error-reject (100),
abstract-syntax-error-ignore-and-notify (101),
abstract-syntax-error-falsely-constructed-message (102)
} (97..112)
CauseMisc ::= INTEGER {
om-intervention (113),
no-resource-available (114),
unspecified-failure (115),
network-optimisation (116)
} (113..128)
CauseNon-Standard ::= INTEGER (129..256)
-- Cause value 256 shall not be used --
CauseRadioNetworkExtension ::= INTEGER {
iP-multicast-address-and-APN-not-valid(257),
mBMS-de-registration-rejected-due-to-implicit-registration(258),
mBMS-request-superseded(259),
mBMS-de-registration-during-session-not-allowed(260),
mBMS-no-data-bearer-necessary(261)
} (257..512)
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核心网相关的释放原因列表（来自google，有颜的是常见原因）：
ISUP消息中rel原因值
G3.1正常类别
原因NO.1：未分配的（未确定的）号码
"unassigned (unallocaled) number"
该原因表示不能到达主叫用户所请求的终点，因为虽然号码格式有效，但该号码目前尚未分配（未确定）。
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