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howto_ims: add a warning for sqn disabling #48

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howto_ims: add a warning for sqn disabling #48

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3 changes: 3 additions & 0 deletions docs/howto_ims.md
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Expand Up @@ -8,6 +8,9 @@ It is possible to activate IMS on PLMN IDs such as 999xx using OMNT. To achieve
* Add the APN in `Access point names`. (Name: *ims*, APN: *ims*, APN type: *ims*, APN protocol: *IPv4*, APN roaming protocol: *IPv4*). After that, save it and leave the **internet** APN selected.

2. Disable SQN checking on SIM cards. (See the *Disabling / Enabling SQN validation* section of the sysmoISIM user manuals)

**WARNING:** This step disables a major security feature of the 3G/4G/5G authentication and key agreement. Without SQN check, there is no protection against authentication replay attacks. Only use if you really know what you’re doing, and only in a lab. It is provided here because it is recommended in [Step 23 of Open5GS's VoLTE tutorial](https://open5gs.org/open5gs/docs/tutorial/02-VoLTE-setup/).

```bash
# Add '--pcsc-shared' flag if the card status includes 'Shared Mode'
# p: Card reader number in the 'pcsc_scan' output
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