1. <--- Transmitting (NAT) to 79.175.xxx.xxx:5060 --->
  2. SIP/2.0 200 OK
  3. Via: SIP/2.0/UDP 79.175.xxx.xxx:5060;branch=z9hG4bK56ad1daf;received=79.175.xxx.xxx;rport=5060
  4. From: "Unknown" <sip:[email protected]>;tag=as2b1847ad
  5. To: <sip:[email protected]:5060>;tag=as38fa00be
  6. Call-ID: [email protected]:5060
  7. CSeq: 102 OPTIONS
  8. Server: FPBX-2.8.1(1.8.20.0)
  9. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH
  10. Supported: replaces, timer
  11. Contact: <sip:192.168.1.150:5060>
  12. Accept: application/sdp
  13. Content-Length: 0
  16. <------------>