Hi Anthony, You are right to a degree, being that the carrier in question is the national PTT, and their equipment is Acme, they are in the belief that their equipment is operating normally. Added to this the fact that we are the only interconnect customer who is actually wanting to do this (new tests had to be added to the sandbox testing to accommodate this) and are relatively small at this point then they have little interest in fixing the issue. The standards are vague at best, and little cross-referencing of existing standards happens when dreaming up a new one. You only have to look at the 3GPP specifications, which take a handful of mainly SIP RFCs and turn them into 000's of pages of standard to see how they need to appear to be specific. Having worked for a relatively small closed-source application server vendor previously, I know what it's like to be on the losing end of a standards argument when doing interop' against a larger vendor. Anyhow, thanks for the pointers and I'll take a look at Sofia and report something to them if need be. I think my first option may be to disable session timers on the test route initially, just to see if there's anything else afoot. Cheers, Neil. -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/uuid-media-hangs-tp5145657p516... Sent from the freeswitch-users mailing list archive at Nabble.com.