Send SMS from chan_dongle module adds @ between chars

Hi!

I am using Asterisk 16.2.1~dfsg-1+deb10u2 on rpi4 and chan_dongle. Receiving sms works fine but when I send sms using command dongle sms dongle0 123456789 test test sms looks like this: @t@e@s@t@ @t@e@s@t. Don’t know what am I doing wrong?

Thank you for your hint/suggestions.

chan_dongle is third party supported code and I don’t believe (any of) its developer(s) frequent this forum.