I have a site that moved to the latest 1.8 revision, and began to have problems with phones in "far away places" (South America, and the MidEast). What I see is that when a Dial() is issued, the sip channel driver sends out an INVITE to the phone. Very soon thereafter, Asterisk retransmits the INVITE. The phone sends back a 100 Trying, and then, usually, a 400 response. I may be misinterpreting what I see, but I *think* that the response from the phone is delayed just enough to invoke the retransmission. The phone responds to the second invite with a 400 code, which Asterisk interprets as an error, and the call immediately goes into hangup. Has anyone else seen this? It doesn't happen all the time, and only with certain phones. It comes and goes, but when it comes, phones become unreachable. It seems to be in this state the majority of the time for certain phones. While most phones seem far away, some are in Florida. We replaced the 1.8 version of Asterisk with a 1.6.2 version, and the issue has gone away. I know, I know, I could give more detail, fill out a bug report, but this is the early stages. I may be misinterpreting what I'm seeing. Anyone else seen this sort of thing? Any words of wisdom? murf -- Steve Murphy ParseTree Corporation -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20120317/3bb2ea55/attachment.htm>