VOIP on my PC was working fine when suddenly it stopped working. I have tried connecting from other PCs in my network they can connect to sip server but my can't. I have disabled the windows firewall, put my pc in DMZ in the network even used my other sip softphones, tired other SIP servers(other providers), tried using VPN as well but still SiP connection doesn't work.

Using Phonerlite the debug shows repeat cycles of this:
14:04:00,180: T: 204.74.213.5:5060 (UDP)
REGISTER sip:sip.callwithus.com SIP/2.0
Via: SIP/2.0/UDP 192.168.0.11:5060;branch=z9hG4bK00262bbca39de11192e44a6eadfe8c23;rport
From: "PhonerLite" ;tag=3525258360
To: "PhonerLite"
Call-ID: 8008FFB7-A39D-E111-92E3-4A6EADFE8C23@192.168.0.11
CSeq: 1 REGISTER
Contact: ;+sip.instance=""
Allow: INVITE, OPTIONS, ACK, BYE, CANCEL, INFO, NOTIFY, MESSAGE, UPDATE
Max-Forwards: 70
User-Agent: SIPPER for PhonerLite
Expires: 900
Content-Length: 0

-------------------------------------------
14:04:00,180: T: 204.74.213.5:5060 (UDP)
SUBSCRIBE sip:115873140@sip.callwithus.com SIP/2.0
Via: SIP/2.0/UDP 192.168.0.11:5060;branch=z9hG4bK00262bbca39de11192e54a6eadfe8c23;rport
From: "PhonerLite" ;tag=3809766518
To:
Call-ID: 8008FFB7-A39D-E111-92E4-4A6EADFE8C23@192.168.0.11
CSeq: 2 SUBSCRIBE
Contact: ;+sip.instance=""
Max-Forwards: 70
User-Agent: SIPPER for PhonerLite
Expires: 1800
Event: message-summary
Accept: application/simple-message-summary
Content-Length: 0
 

I have attached the complete log please see the attachment. I am really frustrated please help me with this

Thankyou admin for replying. Yes i do experience similar issues with other softphones of my pc but on other computers on my network everything works fine which excludes any network issue. Can you please suggest what can be the possible cause?