[Blink] SSL certificate verification error when dialing out

[Lars Noodén]

Hello,

I've got Blink [1] on Linux Mint [2] and it has worked well for a long
time but over the last month or so I started getting SSL verification
errors sometimes when dialing out.  Now for the last week or so, I
cannot dial out at all and get the errors each and every time.  However,
at least for now, I still seem to be able to receive incoming calls, at
least from Blink Pro for MacOS.

Every time I try to dial out, it fails with the message, "SSL
certificate verification error when dialing out"  This happens even with
the call test (3333 at sip2sip.info) and the echo test (4444 at sip2sip.info)
numbers.  Here is a line from the notifications log:

	2021-10-08 18:04:10.343603 [blink 1011]: Notification
	name=SIPRequestDidFail sender=
	<sipsimple.core._core.Request object at 0x7f8f30099130>
	data=NotificationData(code=503, reason=b'SSL certificate
	verification error (PJSIP_TLS_ECERTVERIF)')

What should I be looking for to fix this or which information should I
provide to get assistance?  I can turn on more logging, but can't
interpret the logs.

/Lars

[1]
$ apt-cache policy blink
blink:
   Installed: 5.1.7focal
   Candidate: 5.1.7focal
   Version table:
  *** 5.1.7focal 500
         500 http://ag-projects.com/ubuntu focal/main amd64 Packages
         100 /var/lib/dpkg/status

[2]
$ lsb_release -rd
Description:    Linux Mint 20.1
Release:        20.1