IMSI length fixed

config/custom-ue.yaml

-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-286010000000001'
 # Mobile Country Code value of HPLMN
 mcc: '286'

config/free5gc-ue.yaml

-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-208930000000003'
 # Mobile Country Code value of HPLMN
 mcc: '208'

config/open5gs-ue.yaml

-# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 or 16 digits)
+# IMSI number of the UE. IMSI = [MCC|MNC|MSISDN] (In total 15 digits)
 supi: 'imsi-901700000000001'
 # Mobile Country Code value of HPLMN
 mcc: '901'

src/utils/common_types.cpp

@@ -19,7 +19,7 @@ Supi Supi::Parse(const std::string &supi)
     if (supi[0] == 'i' && supi[1] == 'm' && supi[2] == 's' && supi[3] == 'i' && supi[4] == '-')
     {
         std::string val = supi.substr(5);
-        if (val.size() != 15 && val.size() != 16)
+        if (val.size() != 15)
             throw std::runtime_error("invalid IMSI value");
         for (char c : val)
             if (c < '0' || c > '9')