Hi Everyone, Hoping you can help with an issue I have here. I think it may be after applying the latest service packs, inbound calls no longer work. I am running 3CX version 9, was on SP3, now on SP5a. My set up is as follows: POTS phone line --> Linksys SPA3102 (10.5.1.3) --> 3CX (10.5.1.5) --> Linksys SPA2102 (10.5.1.4) --> Analogue phone If I set the incoming call on the POTS line to go direct to my extension (101), it just keeps ringing. Here are the logs: Code: 421 [CM503016]: Call(19): Attempt to reach <sip:email@example.com:5060> failed. Reason: Not Acceptable HereReason Unknown 22:33:57.406 [CM503003]: Call(19): Call to sip:firstname.lastname@example.org has failed; Cause: 488 Not Acceptable Here; warning: Media type not available; from IP:10.5.1.4:5060 22:33:57.375 [CM503025]: Call(19): Calling Ext:Ext.101@[Dev:sip:email@example.com:5060] 22:33:57.328 [CM503004]: Call(19): Route 1: Ext:Ext.101@[Dev:sip:firstname.lastname@example.org:5060] 22:33:57.328 [CM503010]: Making route(s) to <sip:email@example.com:5060> 22:33:57.328 [CM505002]: Gateway:[Phone Line] Device info: Device Identified: [Man: Linksys;Mod: SPA Series;Rev: General] Capabilities:[reinvite, no-replaces, able-no-sdp, recvonly] UserAgent: [Linksys/SPA3102-5.1.10(GW)] PBX contact: [sip:firstname.lastname@example.org:5060] 22:33:57.312 [CM503001]: Call(19): Incoming call from 288997890@(Ln.10000@Phone Line) to <sip:email@example.com:5060> If a call comes in via a VOIP line, it works fine. Its only a problem coming through the POTS line on the Linksys SPA3102. Any help would be greatly appreciated. Cheers, Hugh.