well, it seems that AAWG uses the https-interface to communicate with the session manager.
We have 2 certificates configured for session manager:
sips with alternative dns name sipsm1.megatech-communication.de
https with a different alternative dns name
And the certificate of the https interface was used, so that causes the warn message.
So thanks for hint. We replaced the https certificate with sips certificate and the warn message "No subject alternative DNS name matching sipsm1.megatech-communication.de found" was gone.
The following is for documentation only if someone have similar problems:
Although the above warn message was gone, the voice mail number was not yet received.
But it seems, that session manager can be contacted, because 2 more properties (IPVideoEnable, IPSoftphoneEnable) are received in JS SDK, which wasn't seen previously.
AvayaClientServices.min.js:1 [5/19/2021, 4:03:52 PM, UTC+02:00] NetworkProvider: CallGatewayProvider,
In the logs I saw, that our secondary session manager was also involved, but no warn or error message appeared in logs.
So we also changed the https-interface certificate of the secondary session manager.
Then, voice mail number was not received.
In AAWG we cleared the AADS cache, but no luck.
We restared AAWG and now the voice mail number was received! Yeah.
Andrey, many thanks for your help!
Maybe you can induce to update the AAWG documentation how the certificate have to be configured in https interface.
In documentation it's shown that AAWG communicates via SIP with session manager, but the certificate of the https-interface was used. That is a little confusing.
Thanks for your time!