Operating system name and version: CentOS 7.7
Version of smsd: 3.1.15-12
Smsd installed from: EPEL
Name and model of a modem / phone: Teltonika TRM250
Interface: USB

we have replaced old HIT-B GPRS with Teltonika TRM250 and changed to Vodafone operator but I'm struggling with config. I have added (init = AT+CPMS="MT" and memory_start=0) and I get incomming sms. But I'm having problem with sending. SMS is always sent but it sends that same sms up to three times and then mark is FAILED. Only sometimes it works as expected and send that same sms only once without FAILED.


When sending sms /var/log/smsd/smsd.log:

2 sms in row (phone number and PDU obfuscated for spam):
First is sent in 2021-06-23 14:42:52,6 and is sent three times with FAILED status
Second sms is sent in 2021-06-23 14:46:36,6 and everything is ok

Any ideas please? Thank you