It seems there is a bug which makes impossible to transfer a call to
arbitrary number (ie. one which isn't in the contacts list).
How to reproduce this bug?
1. 2001 makes an outbound call to number 0123456789
2. Once call is connected 2001 click transfer button.
3. 2001 types "2002" (firstname.lastname@example.org is not in 2001 contacts
list) into "Enter name or number" field and clicks "Transfer" button.
Expected behavior: call is transfered to user email@example.com
Actual behavior: "Transfer transfer" window is closed and nothing
happens. Call remains connected to 2001.
Tested with Jitsi 2.3.4736 on Debian and Windows 7.