SSL Issue With Bundled Ubuntu Package

Hi all,

I've installed Kannel as bundled package through apt (both Ubuntu 20 and 
18 LTS). If I try to connect to an SMPP provider using SSL I do get this 
error:

2021-02-15 09:10:56 [19508] [7] ERROR: SSL write failed: OpenSSL error 
5: error:00000005:lib(0):func(0):DH lib
2021-02-15 09:10:56 [19508] [7] ERROR: SSL read failed: OpenSSL error 5: 
error:00000005:lib(0):func(0):DH lib
2021-02-15 09:10:56 [19508] [7] ERROR: SMPP[mysmpp]: I/O error or other 
error. Re-connecting.
2021-02-15 09:10:56 [19508] [7] ERROR: SSL write failed: OpenSSL error 
5: error:00000005:lib(0):func(0):DH lib
2021-02-15 09:10:56 [19508] [7] ERROR: SMPP[mysmpp]: Couldn't connect to 
SMS center (retrying in 10 seconds).

Connecting without SSL works as expected. The same behavior can be 
observed with another SMPP-provider.

Does the bundled version of Kannel in Ubuntu not support SSL? Do I 
better build it from source?

Thanks a lot!

Dave.