[srslte-users] srsEPC multiple SIM with same IMSI

[Ignas Jarusevicius]

Hi Pedro,

Thank you for your answers.

The SIM's with same IMSI use XOR algorithm.

Regards,
Ignas

On 2018-12-07 12:56, Pedro Alvarez wrote:
> Hi Ignas --
>
> See my reply inline:
>
> On Fri, Dec 7, 2018 at 8:00 AM Ignas Jarusevicius
> <i.jarusevicius at limemicro.com> wrote:
>> Hello,
>>
>> I have multiple test SIM cards with same IMSI/keys. Does srsEPC support
>> connection of multiple UEs with the same IMSI? From my initial testing
>> it seems that the second UE (with same IMSI) is unable connect once one
>> is connected.
> This is not a supported feature at the moment. This is probably not
> very hard to implement, but I won't have the time to look into this
> for a while.
> I'll try to get a look at this at the end of next week, just to see
> how much work is involved. Just to be clear, these SIM's use XOR as
> the authentication algorithm, correct?
>
>> Also, some time ago Pedro sent me a patch to make srsEPC work with sony
>> Xperia F3111 phones:
>>
>>> diff --git a/lib/src/asn1/liblte_mme.cc b/lib/src/asn1/liblte_mme.cc
>>> index 5cb00e5..59a86d9 100644
>>> --- a/lib/src/asn1/liblte_mme.cc
>>> +++ b/lib/src/asn1/liblte_mme.cc
>>> @@ -320,7 +320,7 @@ LIBLTE_ERROR_ENUM
>>> liblte_mme_pack_mobile_id_ie(LIBLTE_MME_MOBILE_ID_STRUCT  *mob
>>>              odd = false;
>>>          }else if(LIBLTE_MME_MOBILE_ID_TYPE_TMSI ==
>>> mobile_id->type_of_id){
>>>              id32 = mobile_id->tmsi;
>>> -            length = 4;
>>> +            length = 5;
>>>              odd = false;
>>>          }
>>>          }else{
>> However, it is still not in master. Is there a reason why it is not
>> included? Does it cause issues for others devices?
> Not sure why this didn't get into master. When I was trying to debug
> the Xperia issue I tried multiple different things that In the end had
> nothing to do with the actual issue.
> When merging the actual solution back into next I probably just forgot
> to add this part. Sorry about that, it's in next now and will be in
> master for the next release.
>
>> Regards,
>> Ignas
> Cheers,
> Pedro