Hi people, My ISP provider is very special and forces me to reset the user and host part of my external profile. At the current stage, FS sets the endpoint user ID as sip-from user, and the external ip-address as the sip-from host and the ISP gateway returns me a 404 not found. When I turn off the PBX and register to the gateway directly with a softphone, the softphone can place a call. sip-from user is the userID of the gateway login and host the proxy address of the gateway. How can I set a new sip-from-user and host prior bridging a call to the gateway? I found 2 channel variables. variable_sip_from_user - sip_from_user variable_sip_from_host - sip_from_host Is that the solution manipulating these variables? Am I capable manipulate those ? Would that be the solution ? I am a little bit new to FS. For a dialplan example I welcome thankfully any advise. wireshark dump: JITSI Softphone Call: Session Initiation Protocol (100)     Status-Line: SIP/2.0 100 trying -- your call is important to us         Status-Code: 100         [Resent Packet: False]         [Request Frame: 2481]         [Response Time (ms): 13]     Message Header         Call-ID: bb85334b160ce6cb26ab480fd2a13236@0:0:0:0:0:0:0:0         [Generated Call-ID: bb85334b160ce6cb26ab480fd2a13236@0:0:0:0:0:0:0:0]         CSeq: 2 INVITE             Sequence Number: 2             Method: INVITE         From: "117xxxxxx" <sip:117xxxxxx@sip12.e-fon.ch>;tag=51a3e1d6             SIP Display info: "117xxxxxx"             SIP from address: sip:117xxxxxx@sip12.e-fon.ch                 SIP from address User Part: 117xxxxxx                 SIP from address Host Part: sip12.e-fon.ch             SIP from tag: 51a3e1d6         To: <sip:0764823425@sip12.e-fon.ch>             SIP to address: sip:076xxxxxxx@sip12.e-fon.ch                 SIP to address User Part: 076xxxxxxx                 SIP to address Host Part: sip12.e-fon.ch         Via: SIP/2.0/UDP 217.162.xxx.xxx:5060;branch=z9hG4bK-383638-321b4bfd0c24f1f48906ff6382c3b18b;rport=5060             Transport: UDP             Sent-by Address: 217.162.xxx.xxx             Sent-by port: 5060             Branch: z9hG4bK-383638-321b4bfd0c24f1f48906ff6382c3b18b             RPort: 5060         Content-Length: 0 (successfull placing the call) FS Call: Session Initiation Protocol (404)     Status-Line: SIP/2.0 404 Not found         Status-Code: 404         [Resent Packet: False]         [Request Frame: 12659]         [Response Time (ms): 13]     Message Header         Via: SIP/2.0/UDP 217.162.xxx.xxx:5080;rport=5080;branch=z9hG4bKmNHFUDQav3tUj;received=217.162.xxx.xxx             Transport: UDP             Sent-by Address: 217.162.xxx.xxx             Sent-by port: 5080             RPort: 5080             Branch: z9hG4bKmNHFUDQav3tUj             Received: 217.162.xxx.xxx         From: "1000" <sip:1000@217.162.xxx.xxx>;tag=gNe9eHQm44HBj             SIP Display info: "1000"             SIP from address: sip:1000@217.162.xxx.xxx                 SIP from address User Part: 1000                 SIP from address Host Part: 217.162.xxx.xxx             SIP from tag: gNe9eHQm44HBj         To: <sip:076xxxxxxx@sip12.e-fon.ch>;tag=56dedfd3319cd1b9fedc1197b499329c.26ea             SIP to address: sip:076xxxxxxx@sip12.e-fon.ch                 SIP to address User Part: 076xxxxxxx                 SIP to address Host Part: sip12.e-fon.ch             SIP to tag: 56dedfd3319cd1b9fedc1197b499329c.26ea         Call-ID: 84f02fe4-71ef-1238-b881-00012e808c2d         [Generated Call-ID: 84f02fe4-71ef-1238-b881-00012e808c2d]         CSeq: 11458424 INVITE             Sequence Number: 11458424             Method: INVITE         Content-Length: 0