Jigasi answers incoming calls but there is no audio

I installed and configured Jigasi to work with a sip provider from which I am renting a trunk.
When I call the number, the Jitsi UI indicates that the caller is connected but there is no audio, just silence on the phone and from Jitsi. In the Jigasi.log I see the following:

2020-08-03 20:51:21.409 INFO: [124] service.protocol.media.MediaHandler.registerDynamicPTsWithStream().1003 Dynamic PT map: 126=rtpmap:-1 telephone-event/8000; 111=rtpmap:-1 opus/48000/2 fmtp:useinbandfec=1;minptime=10; 103=rtpmap:-1 unknown/90000;
2020-08-03 20:51:21.409 INFO: [124] service.protocol.media.MediaHandler.registerDynamicPTsWithStream().1020 PT overrides [103->104 ]
java.net.UnknownHostException: [domainname]: [domainname]: Name or service not known
at java.base/java.net.InetAddress.getLocalHost(InetAddress.java:1642)
at org.opentelecoms.javax.sdp.NistSdpFactory.createSessionDescription(NistSdpFactory.java:44)
at net.java.sip.communicator.impl.protocol.sip.sdp.SdpUtils.createSessionDescription(SdpUtils.java:591)
at n

where domainname is the one used in jitsi.[domainname].com.

Any help would be appreciated where I might have configured something wrong or why I have no audio on the connected call.

On other question: I am configured to connect a caller to a particular room name. How can I have the caller to connect to a meeting room of their choice?

Thank you.