Hi First time trying this mailing list, I have my FS server in a data centre, which feeds site a, site b etc. over a fibre network. We are having really bad call quality issues at one of the sites. The residents report that every second or 2 there is a hiccup in the incoming voice and they miss a portion of the voice. It is consistent and affects everybody. I did some wireshark tracing of both sides of the calls (ext - fs and fs - provider) and to me it appears packets coming from my server have a wrong timestamp every second or so. The server is not over loaded and is pretty default Ubuntu 10.04 LTS, latest FS Head on there. I spent a week trying to diagnose with both the fibre provider and trunk provider but we couldn't figure out the cause. I then tried putting rtp-rewrite-timestamps in both the profiles (external one to provider, and internal one specifically for fibre company) and the problem appears to have gone away. I would like to figure out what is/was causing the issue and also find out if that option puts any extra overhead on the server. If there is almost no overhead I would probably leave it on and just assume I need I for this specific connection. I don't have the issue at another site over same fibre network and trunk provider, and people connecting direct over internet don't suffer same problem. I have about 2gb of wireshark traces I can put online if required. Thanks, Nathan