pri-group timeslots command dissapears from running-config after router reload

[Frantisek Opravil]

ISR4321/K9 router with NIM-1MFT-T1/E1 module, isr4300-universalk9.16.06.02.SPA.bin software,
configured for Euro ISDN connection to PSTN provider, did not connect to PSTN after power outage.
Investigation shows, that the following commands are missing from running-config:

---

pri-group timeslots 1-31

interface Serial0/1/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

voice-port 0/1/0:15

---

Connection to PSTN can be restored by the following configuration commands:

controller E1 0/1/0
pri-group timeslots 1-31

---
According to my information the E1 line from PSTN provider was probably down for some time after the gateway was up.
It is the same as if the gateway is restarted with the ISDN/PRI E1 line disconnected.
Do you know how to configure the E1 controller to start the E1 trunk after controller reload under such conditions?

[jonathan.salter]

Sounds like a write mem was never done on the router.

[Frantisek Opravil]

To illustrate disappearing "pri-group timeslots" command I enclose router startup and running configuration after a reload. 

[Frantisek Opravil]

Sorry, did not know how to attach 2 files in 1 reply.

[Frantisek Opravil · Accepted solution]

The issue is solved now with TAC help, ticket SR 685130611.

Issue was caused using incorrect codec complexity:

...

voice-card 0/1

codec complexity medium

　

controller E1 0/1/0

clock source line primary

pri-group timeslots 1-31
...

And during router reload an error was output to console:
... 

E1 0/1/0: No voice port or DSP resource for voice feature

E1 0/1/0: For MFT T1E1 modules, pri-group has to have DSP (PVDM4) modules installed.

E1 0/1/0: Please check if DSP module is plugged in before configuring pri-group!

E1 0/1/0: This pri-group configuration is REJECTED!

%No configuration will be applied

interface Serial0/1/0:15

^

% Invalid input detected at '^' marker.

...

voice-port 0/1/0:15

^

% Invalid input detected at '^' marker.

...

When using codec complexity flex, router reloads OK.