finally,
1. If client has isr4451-x. You can suggest him to check hsec licence and buy some cards:
- For LTE it's NIM-LTEA card
- For extra wan ports (L3) it's NIM-2GE-CU-SFP
2. if client wants to buy new devices you can recommend him to buy C8200-1N-4T with HSEC licence and buy some cards:
- For LTEit's NIM-LTEA card
- For extra wan ports (L3) it's C-NIM-2T