Yes, it looks like a gift from Microsoft.

If the network is blocked the skype client can start
pulse     5042  0.0  0.6 296340  6536 ?        S<l  10:15   0:00 /usr/bin/pulseaudio --system=true --daemonize=true --log-level=info --log-target=sys
root      5224  0.0  1.2 114444 13124 pts/0    S    10:25   0:00 /usr/bin/Xvfb :101 -ac -nolisten tcp -screen 0 640x480x8
root      5230  2.3 11.8 432300 120204 pts/0   Sl   10:25   0:38 /usr/local/freeswitch/skypopen/skype-clients-symlinks-dir/skype101 --dbpath=/usr/loc
root      5382  1.3  5.8 885068 59076 ?        S<l  10:29   0:19 freeswitch -nc
root      5715  0.0  0.0      0     0 ?        S    10:40   0:00 [kworker/0:0]
root      5864  0.0  0.0      0     0 ?        S    10:45   0:00 [kworker/0:1]
root      6009  0.0  0.0      0     0 ?        R    10:51   0:00 [kworker/0:2]
root      6057  0.0  0.3 151072  3732 pts/0    R+   10:52   0:00 ps -aux

However, after network unblocking it can't register and simply hear on the local interface

netstat -anp | grep skype
udp        0      0 127.0.0.1:34693         0.0.0.0:*                           5230/skype101 

So mod_skypopen can't be loaded
2017-11-18 10:50:20.498691 [DEBUG] skypopen_protocol.c:220     [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  220  ][skype101       ][IDLE,IDLE] If I don't connect immediately, please give the Skype client authorization to be connected by Skypopen (and to not ask you again)
2017-11-18 10:50:21.498715 [DEBUG] skypopen_protocol.c:1767    [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  1767 ][skype101       ][IDLE,IDLE] SENDING: |||PROTOCOL 999||||
2017-11-18 10:50:21.498715 [DEBUG] skypopen_protocol.c:207     [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  207  ][skype101       ][IDLE,IDLE] READING: |||ERROR 68|||
2017-11-18 10:50:21.498715 [DEBUG] skypopen_protocol.c:220     [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  220  ][skype101       ][IDLE,IDLE] If I don't connect immediately, please give the Skype client authorization to be connected by Skypopen (and to not ask you again)
2017-11-18 10:50:22.518673 [DEBUG] skypopen_protocol.c:1767    [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  1767 ][skype101       ][IDLE,IDLE] SENDING: |||PROTOCOL 999||||
2017-11-18 10:50:22.538674 [DEBUG] skypopen_protocol.c:207     [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  207  ][skype101       ][IDLE,IDLE] READING: |||ERROR 68|||
2017-11-18 10:50:22.538674 [DEBUG] skypopen_protocol.c:220     [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [DEBUG_SKYPE  220  ][skype101       ][IDLE,IDLE] If I don't connect immediately, please give the Skype client authorization to be connected by Skypopen (and to not ask you again)
2017-11-18 10:50:23.538681 [ERR] mod_skypopen.c:1838          [1.6.19+git~20171019T182535Z~f51b5d2dce~64bit ] [ERRORA       1838 ][skype101       ][IDLE,IDLE] The Skype client to which we are connected FAILED to gave us CURRENTUSERHANDLE=xenia.obolenskaya, interface_id=1 FAILED to start. No Skype client logged in as 'xenia.obolenskaya' has been found. Please (re)launch a Skype client logged in as 'xenia.obolenskaya'. Skypopen exiting now

Shame and disgrace to Microsoft!

Regards,

Xenia Obolenskaya