Michael Collins a écrit :
A 404 in SIP is just like a 404 when web surfing: the target server can't find whatever it is that you're looking for. In other words, your FS server made contact with the server at the far end, told it what endpoint you're looking for, and the server there said, "I can't find this endpoint, sorry." You'll need to see what's happening at the far end, like whether there really is a 300 or not. -MC
Thanks for your help Michael. Thanks to the SIP trace mode, I saw that, as you said, the remote server can be contacted but, it can't find the phone with the number 300 : send 1135 bytes to udp/[PBX IP ADDRESS]:5060 at 07:36:50.305204: ------------------------------------------------------------------------ INVITE sip:300@[PBX IP ADDRESS] SIP/2.0 recv 463 bytes from udp/[FS IP ADDRESS]:5060 at 07:11:33.165472: ------------------------------------------------------------------------ SIP/2.0 404 Not Found Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, PRACK, REFER, NOTIFY User-Agent: OxO_GW_710/022.001 To: <sip:300@[PBX IP ADDRESS]>;tag=f75e19901fe0d4a3eed1295e30a93b53 But the private number 300 exist and work very well. So i guess the way to join the endpoint (an Alcatel IP phone) is not the good one. I even tried with the public number. I don't think the pbx can find 300@[PBX IP ADDRESS], it can only find 300 as this phone already has an IP address.