1. <--- SIP read from UDP:79.175.xxx.xxx:5060 --->
  2. OPTIONS sip:[email protected]:5060 SIP/2.0
  3. Via: SIP/2.0/UDP 79.175.xxx.xxx:5060;branch=z9hG4bK37c0a98c;rport
  4. From: "Unknown" <sip:[email protected]>;tag=as7160fa4d
  5. To: <sip:[email protected]:5060>
  6. Call-ID: [email protected]:5060
  7. CSeq: 102 OPTIONS
  8. Contact: <sip:[email protected]:5060>
  9. max-forwards: 69
  10. user-agent: DTSW
  11. date: Sat, 11 Apr 2015 15:16:59 GMT
  12. supported: replaces
  13. supported: timer
  14. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
  15. Content-Length: 0
  17. <------------->