Merge pull request #98 from finntenzor/master

Add "rport" in via to support NAT.

Author: cloudwebrtc

pkg/stack/stack.go

@@ -291,7 +291,7 @@ func (s *SipStack) handleRequest(req sip.Request, tx sip.ServerTransaction) {
 go handler(req, tx)
 }
 
-//Request Send SIP message
+// Request Send SIP message
 func (s *SipStack) Request(req sip.Request) (sip.ClientTransaction, error) {
 if !s.running.IsSet() {
 return nil, fmt.Errorf("can not send through stopped server")
@@ -378,6 +378,7 @@ func (s *SipStack) prepareRequest(req sip.Request) sip.Request {
 ProtocolName: "SIP",
 ProtocolVersion: "2.0",
 Params: sip.NewParams().
+Add("rport", nil).
 Add("branch", sip.String{Str: sip.GenerateBranch()}),
 }