Ok i managed to get it done.
I used encoding as you suggested combined with translation of common letters such a "K" greek to "K" english.
Thank you for your help

13:28:57: DEBUG: 14: (SmppClient) Sending PDU: SubmitSm, Length: 16, Status: ESME_ROK, Sequence: 131313
13:28:57: TRACE: 14: (SmppSocket) Socket #9008175: Sending data ...

_client.MapEncoding(DataCodings.Default, new Inetlab.SMPP.Encodings.GSMEncoding);
_client.Submit(sm);

Hello . Thanks for fast reply.
Try GSM Encoding without 7 bit packing not worked.
I gived it a try with both Latin1 and default

According to my sms provider i have to use included attachment pdf map
You can get it from
https://drive.google.com/folderview?id= ... sp=sharing

Hello thanks for reply.
No unfortunately its not working.
If i set to client.MapEncoding(DataCodings.Default, new Inetlab.SMPP.Encodings.GSMPackedEncoding()); then no sms arraives to phone at all
However if i use client.MapEncoding(DataCodings.Latin1, new Inetlab.SMPP.Encodings.GSMPackedEncoding ...

Hello. Im trying to send sms with greek characters.
According to my provider i should use default encoding.
When im sending English characters everything is ok .
Unfortunately its not seems to be working when sending Greek characters message is unredable.
However message is readable when using ...