MC7455: Linux Routing - Manually Configure Networking

[JM]

FWIW, the excellent qmi-firmware-update tool upgraded the firmware on the MC7455 from the original 02.08.02.00_Generic to the latest 02.24.05.06 Verizon image.  Very simple and elegant!

When I reestablished the LTE connection (now using the Verizon image), I saw that IMS was registered automatically without any additional changes to the commands mentioned earlier.  Pretty cool.  

AT!GSTATUS?
!GSTATUS: 
Current Time:  318              Temperature: 27
Reset Counter: 1                Mode:        ONLINE         
System mode:   LTE              PS state:    Attached     
LTE band:      B4               LTE bw:      20 MHz  
LTE Rx chan:   2050             LTE Tx chan: 20050
LTE CA state:  NOT ASSIGNED
EMM state:     Registered       Normal Service 
RRC state:     RRC Connected  
IMS reg state: Full Srv         IMS mode:    Normal       

PCC RxM RSSI:  -69              RSRP (dBm):  -102
PCC RxD RSSI:  -89              RSRP (dBm):  -132
Tx Power:      0                TAC:         1A02 (6658)                                                                                          
RSRQ (dB):     -12.3            Cell ID:     0067A00C (6791180)                                                                                   
SINR (dB):      6.4    

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