WCDMA Attach Procedure

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WCDMA Attach Procedure

WCDMA initial attach to the network, step by step messages from Network <=> MS


1. [0x412F/004/007] OTA LOG  BCCH-BCH DL/Complete SIB List
[0x412F] WCDMA Signaling Messages
Channel Type = DL_BCCH_BCH, Radio Bearer ID = 40, Uarfcn = 10807, Psc = 404, Message Length = 31
Interpreted PDU:
value BCCH-BCH-Message ::=
{
message
{
sfn-Prime 106,
payload completeSIB-List :
{
sib-Type systemInformationBlockType1,
sib-Data-variable '11100110 00110011 11100001 00001000 010 ...'B
}

2. [0x412F/254/001] OTA LOG BCCH-BCH DL/System Information Block Type 1
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 20
Interpreted PDU:
value SysInfoType1 ::=
{
cn-CommonGSM-MAP-NAS-SysInfo '8CF8'H,
cn-DomainSysInfoList
{
{
cn-DomainIdentity cs-domain,
cn-Type gsm-MAP : '0A01'H,
cn-DRX-CycleLengthCoeff 6
},

3. [0x412F/004/001] OTA LOG BCCH-BCH DL/First Segment    
[0x412F] WCDMA Signaling Messages
Channel Type = DL_BCCH_BCH, Radio Bearer ID = 40, Uarfcn = 10807, Psc = 404, Message Length = 31
Interpreted PDU:
value BCCH-BCH-Message ::=
{
message
{
sfn-Prime 107,
payload firstSegment :
{
sib-Type systemInformationBlockType11,
seg-Count 6,
sib-Data-fixed '10011001 10000000 00011100 10110100 110 ...'B
}

4. [0x412F/254/000] OTA LOG BCCH-BCH DL/Master Information Block
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 19
Interpreted PDU:
value MasterInformationBlock ::=
{
mib-ValueTag 5,
plmn-Type gsm-MAP :
{
plmn-Identity
{
mcc
{
4,0,4
},
mnc
{
0,7
}

5. [0x412F/254/002] OTA LOG BCCH-BCH DL/System Information Block Type 2   
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 4
Interpreted PDU:
value SysInfoType2 ::=
{
ura-IdentityList
{
'10001100 11111000'B
}

6. [0x412F/254/007] OTA LOG BCCH-BCH DL/System Information Block Type 7    
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 4
Interpreted PDU:
value SysInfoType7 ::=
{
modeSpecificInfo fdd :
{
ul-Interference -96
},
prach-Information-SIB5-List
{
1
}

7. [0x412F/254/027] OTA LOG BCCH-BCH DL/Scheduling Block 1
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 13
Interpreted PDU:
value SysInfoTypeSB1 ::=
{
sib-ReferenceList
{
sib-Type sysInfoType1 : 2,
scheduling
{
sib-Pos rep64 : 10
}

8. [0x412F/004/002] OTA LOG BCCH-BCH DL/Subsequent Seqment
[0x412F] WCDMA Signaling Messages
Channel Type = DL_BCCH_BCH, Radio Bearer ID = 40, Uarfcn = 10807, Psc = 404, Message Length = 31
Interpreted PDU:
value BCCH-BCH-Message ::=
{
message
{
sfn-Prime 110,
payload subsequentSegment :
{
sib-Type systemInformationBlockType11,
segmentIndex 1,
sib-Data-fixed '01000000 01011010 11011010 10010000 101 ...'B
}

9. [0x412F/254/005] OTA LOG  BCCH-BCH DL/System Information Block Type 5
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 74
Interpreted PDU:
value SysInfoType5bis ::=
{
sib6indicator FALSE,
pich-PowerOffset -7,
modeSpecificInfo fdd :
{
aich-PowerOffset -6
},
primaryCCPCH-Info fdd :
{
tx-DiversityIndicator FALSE
},

10. [0x412F/254/003] OTA LOG BCCH-BCH DL/System Information Block Type 3
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 19
Interpreted PDU:
value SysInfoType3 ::=
{
sib4indicator FALSE,
cellIdentity '00100110 00000101 10100110 1100'B,
cellSelectReselectInfo
{
cellSelectQualityMeasure cpich-Ec-N0 :
{
      }

11. [0x412F/254/011] OTA LOG  BCCH-BCH DL/System Information Block Type 11
[0x412F] WCDMA Signaling Messages
Channel Type = Complete SIB (254) , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 154
Interpreted PDU:
value SysInfoType11 ::=
{
sib12indicator FALSE,
fach-MeasurementOccasionInfo
{
fACH-meas-occasion-coeff 4,
inter-freq-FDD-meas-ind FALSE,
inter-freq-TDD-meas-ind FALSE,
inter-RAT-meas-ind
{
gsm
}

12. [0x412F/009/067] OTA LOG Extension SIB (BCCH-BCH DL)/System Information Type 19   
[0x412F] WCDMA Signaling Messages
Channel Type = Extension SIB , Radio Bearer ID = 40, Uarfcn = N/A, Psc = N/A, Message Length = 10
Interpreted PDU:
value SysInfoType19 ::=
{
utra-PriorityInfoList
{
utra-ServingCell
{
priority 3,
s-PrioritySearch1 2,
s-PrioritySearch2 2,
threshServingLow 1
}

13. [0x412F/000/001] OTA LOG CCCH UL/RRC Connection Request
[0x412F] WCDMA Signaling Messages
Channel Type = UL_CCCH, Radio Bearer ID = 0, Uarfcn = N/A, Psc = N/A, Message Length = 16
Interpreted PDU:
value UL-CCCH-Message ::=
{
message rrcConnectionRequest :
{
initialUE-Identity imsi :
{
4,0,4,1,3,2,0,6,0,2,2,8,9,5,1
},
establishmentCause registration,
protocolErrorIndicator noError,
measuredResultsOnRACH
},

14. [0x412F/002/003] OTA LOG CCCH DL/RRC Connection Setup
[0x412F] WCDMA Signaling Messages
Channel Type = DL_CCCH, Radio Bearer ID = 0, Uarfcn = N/A, Psc = N/A, Message Length = 133
Interpreted PDU:
value DL-CCCH-Message ::=
{
message rrcConnectionSetup : later-than-r3 :
{
initialUE-Identity imsi :
{
4,0,4,1,3,2,0,6,0,2,2,8,9,5,1
},
rrc-TransactionIdentifier 0,
criticalExtensions criticalExtensions : criticalExtensions : criticalExtensions : criticalExtensions : criticalExtensions : r9 :
}

15. [0x412F/001/018] OTA LOG DCCH UL/RRC Connection Setup Complete  
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 114
Interpreted PDU:
value UL-DCCH-Message ::=
{
message rrcConnectionSetupComplete :
{
rrc-TransactionIdentifier 0,
startList
{
cn-DomainIdentity cs-domain,
start-Value '00000000 00000000 0100'B
},

16. [0x412F/001/005] OTA LOG DCCH UL/Initial Direct Transfer   
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 3, Uarfcn = N/A, Psc = N/A, Message Length = 32
Interpreted PDU:
value UL-DCCH-Message ::=
{
message initialDirectTransfer :
{
cn-DomainIdentity cs-domain,
intraDomainNasNodeSelector
{
version release99 :
{
cn-Type gsm-Map-IDNNS :
{
routingbasis iMSIcauseUEinitiatedEvent :
{
routingparameter '11011111 11'B
},

17. [0x713A/008/001] OTA LOG GMM/Attach Request
Direction : MS To Network
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
msg_type = 1 (0x1)
GMM_ATTACH_REQUEST

18. [0x412F/003/005] OTA LOG DCCH DL/Downlink Direct Transfer
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 3, Uarfcn = N/A, Psc = N/A, Message Length = 43
Interpreted PDU:
value DL-DCCH-Message ::=
{
message downlinkDirectTransfer : r3 :
{
downlinkDirectTransfer-r3
{
rrc-TransactionIdentifier 1,
cn-DomainIdentity ps-domain,
nas-Message '0812104021C96FB37D0000000079765149 ...'H
}

19. [0x713A/008/018] OTA LOG GMM/Authentication And Ciphering Request
Direction : Network To MS     
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
msg_type = 18 (0x12)
GMM_AUTHENTICATION_AND_CYPHERING_REQUEST

20. [0x713A/008/019] OTA LOG GMM/Authentication And Ciphering Response
Direction : MS To Network  
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
GMM_AUTHENTICATION_AND_CYPHERING_RESPONSE
auth_param_resp_incl = 1 (0x1)
auth_param_resp
sres_val = 2495335984 (0x94bbce30)

21. [0x412F/001/027] OTA LOG DCCH UL/Uplink Direct Transfer
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 3, Uarfcn = N/A, Psc = N/A, Message Length = 28
Interpreted PDU:
value UL-DCCH-Message ::=
{
message uplinkDirectTransfer :
{
cn-DomainIdentity ps-domain,
nas-Message '0813042294BBCE30230993116538003089 ...'H
}

22. [0x412F/003/016] OTA LOG DCCH DL/Security Mode Command
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 16
Interpreted PDU:
value DL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '00010101 01010011 00111001 11001011'B,
rrc-MessageSequenceNumber 1
},
message securityModeCommand : r3 :
{
securityModeCommand-r3
{
rrc-TransactionIdentifier 2,
securityCapability
{
cipheringAlgorithmCap { uea1, uea0 },
integrityProtectionAlgorithmCap { uia1 }
},

23. [0x412F/001/020] OTA LOG DCCH UL/Security Mode Complete
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 9
Interpreted PDU:
value UL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10010111 11100000 10111111 10101011'B,
rrc-MessageSequenceNumber 1
},

24. [0x713A/008/021] OTA LOG GMM/Identity Request
Direction : Network To MS
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
GMM_IDENTITY_REQUEST
ident_type
type_of_identity = 2 (0x2)

25. [0x713A/008/022] OTA LOG GMM/Identity Response
Direction : MS To Network  
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
msg_type = 22 (0x16)
GMM_IDENTITY_RESPONSE
ident_type = 2 (0x2)
odd_even_ind = 1 (0x1)
num_ident = 15 (0xf)

26. [0x713A/005/018] OTA LOG MM/Authentication Request
Direction : Network To MS
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 5 (0x5)
prot_disc = 5 (0x5) (GSM_MOB_MANAGEMENT)
msg_type = 18 (0x12)
AUTHENTICATION_REQUEST
cip_key_seq_num
key_sequence = 0 (0x0)

27. [0x412F/003/000] OTA LOG DCCH DL/Active Set Update
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 21
Interpreted PDU:
value DL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10000010 01011001 10000111 11011111'B,
rrc-MessageSequenceNumber 2
},
message activeSetUpdate : later-than-r3 :
{
rrc-TransactionIdentifier 1,
criticalExtensions criticalExtensions : criticalExtensions : criticalExtensions : r9 :
}

28. [0x412F/001/000] OTA LOG DCCH UL/Active Set Update Complete
Channel Type = UL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 6
Interpreted PDU:
value UL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10100000 00100011 00011110 01010101'B,
rrc-MessageSequenceNumber 3
},
message activeSetUpdateComplete :
{
rrc-TransactionIdentifier 1
}

29. [0x713A/005/020] OTA LOG MM/Authentication Response
Direction : MS To Network    
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 5 (0x5)
prot_disc = 5 (0x5) (GSM_MOB_MANAGEMENT)
msg_type = 20 (0x14)
AUTHENTICATION_RESPONSE
auth_resp_param
sres_val = 1746064755 (0x6812d573)
resp_len = 4 (0x4)
resp[0] = 91 (0x5b)
resp[1] = 124 (0x7c)
resp[2] = 86 (0x56)
resp[3] = 205 (0xcd)

30. [0x713A/005/008] OTA LOG MM/Location Updating Request
Direction : MS To Network
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 5 (0x5)
prot_disc = 5 (0x5) (GSM_MOB_MANAGEMENT)
LOCATION_UPDATE_REQUEST
loc_area_ident
mcc_1 = 4 (0x4)
mcc_2 = 0 (0x0)
mcc_3 = 4 (0x4)
mnc_3 = 15 (0xf)
mnc_1 = 0 (0x0)
mnc_2 = 7 (0x7)

31. [0x713A/008/002] OTA LOG GMM/Attach Accept
Direction : Network To MS    
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
msg_type = 2 (0x2)
GMM_ATTACH_ACCEPT
radio_pri_val = 3 (0x3)
routing_area_id
mcc_1 = 4 (0x4)
mcc_2 = 0 (0x0)
mcc_3 = 4 (0x4)
mnc_3 = 15 (0xf)
mnc_1 = 0 (0x0)
mnc_2 = 7 (0x7)

32. [0x713A/008/003] OTA LOG GMM/Attach Complete
Direction : MS To Network    
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 8 (0x8)
prot_disc = 8 (0x8) (GSM_GMM_MESSAGES)
msg_type = 3 (0x3)
GMM_ATTACH_COMPLETE
inter_rat_handover_info_incl = 0 (0x0)
eutran_inter_rat_info_incl = 0 (0x0)

33. [0x713A/005/002] OTA LOG MM/Location Updating Accept
Direction : Network To MS
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 5 (0x5)
prot_disc = 5 (0x5) (GSM_MOB_MANAGEMENT)
LOCATION_UPDATE_ACCEPT
loc_area_ident
mcc_1 = 4 (0x4)
mcc_2 = 0 (0x0)
mcc_3 = 4 (0x4)
mnc_3 = 15 (0xf)
mnc_1 = 0 (0x0)
mnc_2 = 7 (0x7)
loc_area_code = 36088 (0x8cf8)

34. [0x713A/010/065] OTA LOG SM/Activate PDP Context Request
Direction : MS To Network    
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 10 (0xa)
prot_disc = 10 (0xa) (GSM_SM_MESSAGES)
msg_type = 65 (0x41)
SM_ACTIVATE_PDP_CONTEXT_REQUEST
req_llc_sapi
llc_sapi_value = 3 (0x3)

35. [0x412F/003/014] OTA LOG DCCH DL/Radio Bearer Setup
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 179
Interpreted PDU:
value DL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10001110 10001001 10111100 10011111'B,
rrc-MessageSequenceNumber 2
},
message radioBearerSetup : later-than-r3 :
{
rrc-TransactionIdentifier 3,
criticalExtensions criticalExtensions : criticalExtensions : criticalExtensions : criticalExtensions : criticalExtensions : r9 :
}

36. [0x412F/001/015] OTA LOG DCCH UL/Radio Bearer Setup Complete
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 9
Interpreted PDU:
value UL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '11010010 10010110 10001111 01111101'B,
rrc-MessageSequenceNumber 3
},
message radioBearerSetupComplete :
{
rrc-TransactionIdentifier 3,
start-Value '00000000 00000000 0110'B
}

37. [0x713A/010/066] OTA LOG SM/Activate PDP Context Accept
Direction : Network To MS     
[0x713A] UMTS UE OTA
chan_type = 0 (0x0)
prot_disc_check = 10 (0xa)
prot_disc = 10 (0xa) (GSM_SM_MESSAGES)
msg_type = 66 (0x42)
SM_ACTIVATE_PDP_CONTEXT_ACCEPT
llc_sapi_value = 3 (0x3)

38. [0x412F/003/017] OTA LOG DCCH DL/Signaling Connection Release
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 2, Uarfcn = N/A, Psc = N/A, Message Length = 6
Interpreted PDU:
value DL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10001001 01110100 11000011 11101111'B,
rrc-MessageSequenceNumber 5
},
message signallingConnectionRelease : r3 :
{
signallingConnectionRelease-r3
{
rrc-TransactionIdentifier 1,
cn-DomainIdentity ps-domain
}

39. [0x412F/003/015] OTA LOG DCCH DL/RRC Connection Release
[0x412F] WCDMA Signaling Messages
Channel Type = DL_DCCH, Radio Bearer ID = 1, Uarfcn = N/A, Psc = N/A, Message Length = 7
Interpreted PDU:
value DL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '10011101 01111010 10010110 11001111'B,
rrc-MessageSequenceNumber 1
},
message rrcConnectionRelease : later-than-r3 :
{
rrc-TransactionIdentifier 0,
criticalExtensions r4 :
{
rrcConnectionRelease-r4
{
n-308 1,
releaseCause normalEvent
}

40. [0x412F/001/017] OTA LOG DCCH UL/RRC Connection Release Complete   
[0x412F] WCDMA Signaling Messages
Channel Type = UL_DCCH, Radio Bearer ID = 1, Uarfcn = N/A, Psc = N/A, Message Length = 6
Interpreted PDU:
value UL-DCCH-Message ::=
{
integrityCheckInfo
{
messageAuthenticationCode '11001010 01010011 00110110 10110001'B,
rrc-MessageSequenceNumber 1
},
message rrcConnectionReleaseComplete :
{
rrc-TransactionIdentifier 0
}

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GSM Attach Procedure

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GSM Attach Procedure GSM initial attach to the network, step by step messages from Network <=> MS 1. [0x5B2F/002/129] | OTA LOG | 07:21:52.178 | GSM DSDS RR Signaling Message Channel Type = RACH (2) Direction = Uplink Message Type = Open Loop CMD ACK (129) Message Length in bytes = 24 L3 Message in Hex:   17 49 06 1B 3E 46 04 F4 94 00 2A C8 00 0A 14 65 4A B8 00 00 81 00 05 9B Decoded Message: prot_disc = 7 (0x7) (GSM_EPS_MOB_MANAGEMENT) msg_type = 73 (0x49) 2.0 0x5B2F/002/129] | OTA LOG | 07:21:52.178 | GSM DSDS RR Signaling Message Channel Type = BCCH (1) Direction = Uplink Message Type = System Information Type 9 (4) Message Length in bytes = 19 L3 Message in Hex:   12 06 15 AB EB 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 Decoded Message: prot_disc = 6 (0x6) (GSM_RR_MANAGEMENT) msg_type = 21 (0x15) MEASUREMENT_REPORT BA_USED = 1 (0x1) DTX_USED = 0 (0x0) RXLEV_FULL_SERVING_CELL = 43 (0x2b) 3G_BA_USED = 1 (0x1) ME...
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LTE IMS MO Call

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LTE IMS MO Call 0x1832  IMS Registration Version = 1 Registration Type = Initial Call Id Length = 59 Call Id = 3512047382_2335928920@2405:204:6c09:13b:ed63:680a:633:8ab7 Request Uri Length = 38 Request Uri = sip:ims.mnc861.mcc405.3gppnetwork.org To Length = 56 To = <sip:405861002372445@ims.mnc861.mcc405.3gppnetwork.org> Result = OK 0x156E  IMS SIP Message  --  IMS_SIP_REGISTER/INFORMAL_RESPONSE Version = 1 Direction = UE_TO_NETWORK SDP Presence = 0 SIP Call ID Length = 59 SIP Message Length = 2506 SIP Message Logged Bytes = 2507 Message ID = IMS_SIP_REGISTER Response Code = INFORMAL_RESPONSE (0) CM Call ID = 255 SIP Call ID = 3512047382_2335928920@2405:204:6c09:13b:ed63:680a:633:8ab7 Sip Message = REGISTER  sip:ims.mnc861.mcc405.3gppnetwork.org SIP/2.0 0x156E   IMS SIP Message  --  IMS_SIP_REGISTER/OK Version = 1 Direction = NETWORK_TO_UE SDP Presence = 0 SIP Call ID Length = 59 ...
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SIP Response Codes

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List of SIP response codes The Session Initiation Protocol (SIP) is a signalling protocol used for controlling communication sessions such as Voice over IP telephone calls. SIP is based around request/response transactions, in a similar manner to the Hypertext Transfer Protocol (HTTP). Each transaction consists of a SIP request (which will be one of several request methods), and at least one response. Contents 11xx—Provisional Responses 22xx—Successful Responses 33xx—Redirection Responses 44xx—Client Failure Responses 55xx—Server Failure Responses 66xx—Global Failure Responses 1xx—Provisional Responses 100 Trying Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. 180 Ringing Destination user agent received INVITE, and is alerting user of call. 181 Call is Being Forwarded Servers can optionally send this response to indicate a call is being forwarded. 182 Queued Indicates that the destination was temporarily unavai...
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