ISR4451 losing dial-peer configuration after upgrade

[Eccom-TAC]

Hi

We have VoiceGateway with E1 line.

Problem we are facing with Voice gateway is, pots and voip dial-peer commands are disappearing after we upgrade. Our operate process is : firstly, we downgrade from the 03.16.05.S.155-3.S5 to 03.15.04.S.155-2.S4, and then upgrade from 03.15.04.S.155-2.S4 to 03.16.06.S.155-3.S6.

when we upgrade the 03.16.06.S.155-3.S6, all the dial-peer commands disappears.  so, we downgrade the current version 03.16.05.S.155-3.S5 and brush into the configuration manually. The first attach is current show tech infor, the second is the fault infor. And why we downgrade and upgrade is that we hit a bug before(CSCvc56422).

[Eccom-TAC]

the fault infor is attach

[R0g22]

Try upgrading to Everest or higher.

[Eccom-TAC]

ok! But why is this case?

[Eccom-TAC]

the missing config:

dial-peer voice 1 pots
destination-pattern 8610
port 0/1/0:15
!
dial-peer voice 8628 voip
destination-pattern 8628...
session target ipv4:192.168.13.64
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 8624 voip
destination-pattern 8624...
session target ipv4:192.168.13.68
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 65 voip
destination-pattern 65T
session target ipv4:192.168.13.190
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 8611 voip
destination-pattern 8611T
session target ipv4:192.168.13.54
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 8621 voip
destination-pattern 8621T
session target ipv4:192.168.13.71
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 852 voip
destination-pattern 852T
session target ipv4:192.168.13.20
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 86592 voip
destination-pattern 86592T
session target ipv4:192.168.11.94
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 86755 voip
destination-pattern 86755T
session target ipv4:192.168.13.53
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 8620 voip
destination-pattern 8620T
session target ipv4:192.168.11.102
dtmf-relay h245-alphanumeric
ip qos dscp cs5 media
!
dial-peer voice 100 voip
destination-pattern .T
session target ras
voice-class h323 1
dtmf-relay h245-signal h245-alphanumeric
no vad
!
dial-peer voice 2 pots
incoming called-number .
direct-inward-dial
!

[R0g22]

Always upgrade to the latest code available to remedy defects etc. I will have to look into if you might be running into another defect at the upgraded code but 15.X is pretty old now.

[Eccom-TAC]

Thank you! any defect in this process?