Merge from python:

  Don't include own IP into call-id: it serves no practical purpose
  and can lead to the information leak.

sippy/headers/sip_call_id.go

@@ -53,7 +53,7 @@ func CreateSipCallId(body string) []SipHeader {
 func (self *SipCallId) genCallId(config sippy_conf.Config) {
     buf := make([]byte, 16)
     rand.Read(buf)
-    self.CallId = hex.EncodeToString(buf) + "@" + config.GetMyAddress().String()
+    self.CallId = hex.EncodeToString(buf)
 }
 
 func NewSipCallIdFromString(call_id string) *SipCallId {