Mail2sms issues

Hello,
I am configuring a foxbox GT2 for my company since a month and I want to use the mail2sms feature.
The issue I face is that (after several resolved issues) i got an "unexpected input in smsd.log.
As I am still a student, I am not used to work with linux engines and I’m not sure how to solve this.
Here are the logs :

2019-01-31 08:42:46.925,3, GSM1: Unexpected input: ^RSSI: 11 ^HCSQ: “WCDMA”,37,30,51
2019-01-31 08:52:10.116,3, GSM1: Unexpected input: ^RSSI: 13 ^HCSQ: “WCDMA”,40,35,55
2019-01-31 08:52:49.722,3, GSM1: Unexpected input: ^RSSI: 11 ^HCSQ: “WCDMA”,38,30,49
2019-01-31 09:04:59.394,3, GSM1: Unexpected input: ^RSSI: 12 ^HCSQ: “WCDMA”,38,32,53
2019-01-31 09:06:37.944,3, GSM1: Unexpected input: ^RSSI: 9 ^HCSQ: “WCDMA”,36,26,45
2019-01-31 09:06:41.753,3, GSM1: Unexpected input: ^RSSI: 11 ^HCSQ: “WCDMA”,38,31,51
2019-01-31 09:08:20.310,3, GSM1: Unexpected input: ^RSSI: 9 ^HCSQ: “WCDMA”,35,26,47
2019-01-31 09:08:34.351,3, GSM1: Unexpected input: ^RSSI: 11 ^HCSQ: “WCDMA”,38,31,51
2019-01-31 09:10:55.200,3, GSM1: Unexpected input: ^RSSI: 9 ^HCSQ: “WCDMA”,36,27,47
2019-01-31 09:11:33.599,3, GSM1: Unexpected input: ^RSSI: 12 ^HCSQ: “WCDMA”,38,33,55
2019-01-31 09:13:07.034,3, GSM1: Unexpected input: ^RSSI: 12 ^HCSQ: “WCDMA”,39,33,53
2019-01-31 09:16:13.902,3, GSM1: Unexpected input: ^RSSI: 7 ^HCSQ: “WCDMA”,33,22,43
2019-01-31 09:16:17.712,3, GSM1: Unexpected input: ^RSSI: 9 ^HCSQ: “WCDMA”,35,27,49
2019-01-31 09:16:31.846,3, GSM1: Unexpected input: ^RSSI: 11 ^HCSQ: “WCDMA”,37,30,51
2019-01-31 09:20:42.670,3, GSM1: Unexpected input: ^RSSI: 8 ^HCSQ: “WCDMA”,33,24,47
2019-01-31 09:21:36.504,3, GSM1: Unexpected input: ^RSSI: 13 ^HCSQ: “WCDMA”,41,35,53

I read on a topic that it could be due to the modem initialization string but I am not sure about it and to be honest, i don’t know properly what it means. Could someone help me?

Best regards,
TimC