I tried to make an audio call with pidgin over an xmpp account on the same host. The two clients are both within my home network. However, as long as the call was picked, Jitsi prompted "Error: Could not establish conection (ICE failed and no relay found)" and the call ended. On the pidgin side, there is no prompt: just the audio chat dialog disappeared. There is no command line output if I launch pidgin from command line. The results are the same no matter which way I do (either call from Jitsi to pidgin or pidgin to Jitsi). Jitsi to Jitsi works well.
Is there any way to debug this? I've asked this on pidgin mailing list as well, but there is no response.