Re: Questions about the SIM card for VoWiFi

Dear, I am Hyunwoo Lee. I am a newbie to configure the custom SIM card. I have one question in configuring sysmoISIM-SJA2 to enable VoWiFi on COTS UEs. The UEs that I am working on are Samsung Galaxy A21, OnePlus 7T, and Motorola G Power. I tried to make the UEs discover the ePDG by sending the DNS query and establish the IPsec channel with my IPsec server. I ran my own DNS server to reply with the IP address of my IPsec server on the DNS query. I tried to make it similar to the T-mobile setting since all of the UEs work well with the T-mobile SIM card. Unfortunately, I could not succeed in enabling VoWiFi on the UEs and I do not know why they do not work and what I can do further. I would appreciate it if someone could help me with this. I described what I did in detail below the line. Thank you in advance for your help! Sincerely, Hyunwoo Lee. ------------------------------ What I did is as follows: 1) Equipments - Two sysmoISIM-SJA2 - PC/SC CCID ISO7816 USB Smart Card Reader - UEs: Samsung Galaxy A21, OnePlus 7T, and Motorola G Power (all of them work well with the T-mobile SIM card) 2) Environment - Ubuntu 18.04 LTS - python 3.6.9 - pySim 1.0 3) Configuration of the SIM cards with pysim - The command that I used to configure the SIM cards (to T-mobile) was: : python3 pySim-prog.py -p 0 -a <adm value> -n name -x 310 -y 260 --imsi=3102601234567890 --msisdn=<telephone number> --epdgid=epdg.epc.mnc260.mcc310.pub.3gppnetwork.org --epdgSelection=310260 --ims-hdomain=ims.mnc260.mcc310.3gppnetwork.org --impi=sip:3102601234567890@ims.mnc260.mcc310.3gppnetwork.org <mailto:sip%3A3102601234567890@ims.mnc260.mcc310.3gppnetwork.org> --impu=sip:3102601234567890@ims.mnc260.mcc310.3gppnetwork.org <mailto:sip%3A3102601234567890@ims.mnc260.mcc310.3gppnetwork.org> --iccid=<ICCID value> - The mnclen value is set to 3 4) UE behavior with the SIM card - Samsung Galaxy A21 : It sends the DNS query for the ePDG, but does not execute the IKE protocol to establish the IPsec channel with the T-mobile core network. - OnePlus 7T and Motorola G Power : It does not send the DNS query for the ePDG. 5) Configuration result - The command that I used to read the SIM card : python3 pySim-read.py -p 0 - The result of the command Using PC/SC reader interface Reading ... Autodetected card type: sysmoISIM-SJA2 ICCID: 8988211000000459514 IMSI: None GID1: ffffffffffffffffffff GID2: ffffffffffffffffffff SMSP: ffffffffffffffffffffffffffffffffffffffffffffffffe1ffffffffffffffffffffffff0581005155f5ffffffffffff000000 SPN: name Show in HPLMN: True Hide in OPLMN: True PLMNsel: 130062ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff PLMNwAcT: 130062ffff # MCC: 310 MNC: 260 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused OPLMNwAcT: 130062ffff # MCC: 310 MNC: 260 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused HPLMNAcT: 130062ffff # MCC: 310 MNC: 260 AcT: UTRAN, E-UTRAN WB-S1, E-UTRAN NB-S1, GSM, GSM COMPACT, cdma2000 HRPD, cdma2000 1xRTT ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ffffff0000 # unused ACC: 0002 MSISDN (NPI=1 ToN=3): 17657759216 Administrative data: 00000003 MS operation mode: normal Ciphering Indicator: disabled SIM Service Table: ff33ffff3f003f0f300cf0c3f00000 Service 1 - CHV1 disable function Service 2 - Abbreviated Dialling Numbers (ADN) Service 3 - Fixed Dialling Numbers (FDN) Service 4 - Short Message Storage (SMS) Service 5 - Advice of Charge (AoC) Service 6 - Capability Configuration Parameters (CCP) Service 7 - PLMN selector Service 8 - RFU Service 9 - MSISDN Service 10 - Extension1 Service 13 - Last Number Dialled (LND) Service 14 - Cell Broadcast Message Identifier Service 17 - Service Provider Name Service 18 - Service Dialling Numbers (SDN) Service 19 - Extension3 Service 20 - RFU Service 21 - VGCS Group Identifier List (EFVGCS and EFVGCSS) Service 22 - VBS Group Identifier List (EFVBS and EFVBSS) Service 23 - enhanced Multi-Level Precedence and Pre-emption Service Service 24 - Automatic Answer for eMLPP Service 25 - Data download via SMS-CB Service 26 - Data download via SMS-PP Service 27 - Menu selection Service 28 - Call control Service 29 - Proactive SIM Service 30 - Cell Broadcast Message Identifier Ranges Service 31 - Barred Dialling Numbers (BDN) Service 32 - Extension4 Service 33 - De-personalization Control Keys Service 34 - Co-operative Network List Service 35 - Short Message Status Reports Service 36 - Network's indication of alerting in the MS Service 37 - Mobile Originated Short Message control by SIM Service 38 - GPRS Service 49 - MExE Service 50 - Reserved and shall be ignored Service 51 - PLMN Network Name Service 52 - Operator PLMN List Service 53 - Mailbox Dialling Numbers Service 54 - Message Waiting Indication Status Service 57 - Multimedia Messaging Service (MMS) Service 58 - Extension 8 Service 59 - MMS User Connectivity Parameters EHPLMN: 130062 # MCC: 310 MNC: 260 ffffff # unused ffffff # unused ffffff # unused USIM Service Table: beff9f9de73e0408400170330006002e00000000 Service 2 - Fixed Dialling Numbers (FDN) Service 3 - Extension 2 Service 4 - Service Dialling Numbers (SDN) Service 5 - Extension3 Service 6 - Barred Dialling Numbers (BDN) Service 8 - Outgoing Call Information (OCI and OCT) Service 9 - Incoming Call Information (ICI and ICT) Service 10 - Short Message Storage (SMS) Service 11 - Short Message Status Reports (SMSR) Service 12 - Short Message Service Parameters (SMSP) Service 13 - Advice of Charge (AoC) Service 14 - Capability Configuration Parameters 2 (CCP2) Service 15 - Cell Broadcast Message Identifier Service 16 - Cell Broadcast Message Identifier Ranges Service 17 - Group Identifier Level 1 Service 18 - Group Identifier Level 2 Service 19 - Service Provider Name Service 20 - User controlled PLMN selector with Access Technology Service 21 - MSISDN Service 24 - Enhanced Multi-Level Precedence and Pre-emption Service Service 25 - Automatic Answer for eMLPP Service 27 - GSM Access Service 28 - Data download via SMS-PP Service 29 - Data download via SMS-CB Service 32 - RUN AT COMMAND command Service 33 - shall be set to 1 Service 34 - Enabled Services Table Service 35 - APN Control List (ACL) Service 38 - GSM security context Service 39 - CPBCCH Information Service 40 - Investigation Scan Service 42 - Operator controlled PLMN selector with Access Technology Service 43 - HPLMN selector with Access Technology Service 44 - Extension 5 Service 45 - PLMN Network Name Service 46 - Operator PLMN List Service 51 - Service Provider Display Information Service 60 - User Controlled PLMN selector for I-WLAN access Service 71 - Equivalent HPLMN Service 73 - Equivalent HPLMN Presentation Indication Service 85 - EPS Mobility Management Information Service 86 - Allowed CSG Lists and corresponding indications Service 87 - Call control on EPS PDN connection by USIM Service 89 - eCall Data Service 90 - Operator CSG Lists and corresponding indications Service 93 - Communication Control for IMS by USIM Service 94 - Extended Terminal Applications Service 106 - ePDG configuration Information support Service 107 - ePDG configuration Information configured Service 122 - 5GS Mobility Management Information Service 123 - 5G Security Parameters Service 124 - Subscription identifier privacy support Service 126 - UAC Access Identities support ePDGId: 657064672e6570632e6d6e633236302e6d63633331302e7075622e336770706e6574776f726b2e6f7267 # epdg.epc.mnc260.mcc310.pub.3gppnetwork.org ePDGSelection: 130062000100 # MCC: 310 MNC: 260 ePDG Priority: 0001 ePDG FQDN format: Operator Identifier FQDN ffffffffffff # unused ffffffffffff # unused ffffffffffff # unused P-CSCF: Not available Not available Not available Not available Not available Not available Not available Not available Home Network Domain Name: ims.mnc260.mcc310.3gppnetwork.org IMS private user identity: sip:3102601234567890@ims.mnc260.mcc310.3gppnetwork.org <mailto:sip%3A3102601234567890@ims.mnc260.mcc310.3gppnetwork.org> IMS public user identity: sip:3102601234567890@ims.mnc260.mcc310.3gppnetwork.org <mailto:sip%3A3102601234567890@ims.mnc260.mcc310.3gppnetwork.org> Not available Not available Not available Not available Not available Not available Not available UICC IARI: Not available Not available Not available Not available Not available Not available Not available Not available ISIM Service Table: 190200 Service 1 - P-CSCF address Service 4 - GBA-based Local Key Establishment Mechanism Service 5 - Support of P-CSCF discovery for IMS Local Break Out Service 10 - Support of UICC access to IMS Done ! Hyunwoo Lee, Ph. D. Network Security Researcher E-mail: hw5773(a)gmail.com Homepage: https://hw5773.github.io