Is anyone else getting an eerie lack of ringback when originating toward T-Mobile? We get a 183 Session Progress with media, then a 180 Ringing a third of a second later. So the result is a 1/3 second long burst of ringback and then silence. We are seeing if we might be able to start locally generating ringback when we see the 180, but to be honest, that's just a weird sequence of messages and I would never expect to receive them in that order. So we didn't exactly plan for it. The relevant trunk is from Comcast, but I highly suspect they are just passing through what they got from T-Mobile (or whoever they route T-Mobile calls through). We are in the north Alabama area and we have heard of other customers with various carriers having similar issues. Just wondering if anyone had a technical reason/explanation or any more information. -- Hunter Fuller (they) Router Jockey VBH M-1A +1 256 824 5331 Office of Information Technology The University of Alabama in Huntsville Network Engineering