I’ve read a couple of pages about VQ RTCP-XR (RFC 6035) which is implemented in some SIP hardphones.
Do you have any experience to share about using VQ RTCP-XR ? Does it help to hightlight issues when those issues come from a provider of your ITSP ?
Which collector do you use to collect VQ RTCP-XR reports ?
I’ve just discovered  and I wonder if alternate things within Homer-Sipcapture.org galaxy exist.