Hi, When I try to registration its giving following log. Its only happen a specific dialer but that dialer also work other softswitch. It's getting problem only with freeswitch. My freeswitch version is 1.6.9 I can't figure out why its happen. How can I overcome this issue and is there any sip message issue or not? So that I can ask those dialer company to fix their issue. Thanks in advance. REGISTER sip:103.12.214.115:5060 SIP/2.0 Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea Max-Forwards: 70 From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060> Call-ID: smvpcaakieaaaaaaaaa CSeq: 1 REGISTER Contact: <sip:wmaeaccba@50.97.212.23:1310> Expires: 3600 Content-Length: 0 SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060>;tag=FavjcHKUKtXFe Call-ID: smvpcaakieaaaaaaaaa CSeq: 1 REGISTER User-Agent: WHaT Rocks! Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, PRACK, NOTIFY Supported: precondition, 100rel, path, replaces WWW-Authenticate: Digest realm="103.12.214.115", nonce="2a9726d3-fac2-4d7b-9773-771b60a35e7a", algorithm=MD5, qop="auth" Content-Length: 0 ACK sip:103.12.214.115:5060 SIP/2.0 Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea Max-Forwards: 70 From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060>;tag=FavjcHKUKtXFe Call-ID: smvpcaakieaaaaaaaaa CSeq: 1 ACK Contact: <sip:wmaeaccba@50.97.212.23:1310> Content-Length: 0 REGISTER sip:103.12.214.115:5060 SIP/2.0 Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea Max-Forwards: 70 From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060>;tag=FavjcHKUKtXFe Call-ID: smvpcaakieaaaaaaaaa CSeq: 2 REGISTER Contact: <sip:wmaeaccba@50.97.212.23:1310> Expires: 3600 Authorization: Digest username="12345678",realm="103.12.214.115",nonce="2a9726d3-fac2-4d7b-9773-77 1b60a35e7a",uri="sip:103.12.214.115:5060",algorithm=MD5,response="73c3beac11 531911319f05807714c047" Content-Length: 0 SIP/2.0 481 Call Does Not Exist Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060>;tag=FavjcHKUKtXFe Call-ID: smvpcaakieaaaaaaaaa CSeq: 2 REGISTER User-Agent: WHaT Rocks! Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, PRACK, NOTIFY Supported: precondition, 100rel, path, replaces Content-Length: 0 ACK sip:103.12.214.115:5060 SIP/2.0 Via: SIP/2.0/UDP 50.97.212.23:1310;branch=z9hG4bKhabaiiea Max-Forwards: 70 From: <sip:12345678@103.12.214.115:5060>;tag=a34xd9anboejegocoaaoeie To: <sip:12345678@103.12.214.115:5060>;tag=FavjcHKUKtXFe Call-ID: smvpcaakieaaaaaaaaa CSeq: 2 ACK Contact: <sip:wmaeaccba@50.97.212.23:1310> Content-Length: 0 Regards Minat