fix: add more info

dialog_integration_test.go

@@ -383,8 +383,12 @@ func TestIntegrationDialogCancel(t *testing.T) {
 
 		// Cancel a call
 		ctx, cancel := context.WithCancel(sess.Context())
-		cancel()
-		err = sess.WaitAnswer(ctx, AnswerOptions{})
+		err = sess.WaitAnswer(ctx, AnswerOptions{OnResponse: func(res *sip.Response) error {
+			if res.StatusCode == sip.StatusRinging {
+				cancel()
+			}
+			return nil
+		}})
 		require.ErrorIs(t, err, context.Canceled)
 		assert.EqualValues(t, 487, sess.InviteResponse.StatusCode)
 	}

dialog_ua.go

@@ -44,9 +44,10 @@ func (c *DialogUA) ReadInvite(inviteReq *sip.Request, tx sip.ServerTransaction)
 	// Temporarly fix
 	if stx, ok := tx.(*sip.ServerTx); ok {
 		stx.OnTerminate(func(key string) {
+			// TODO use transaction error for better checking why it terminated
 			state := dtx.LoadState()
 			if state < sip.DialogStateEstablished {
-				// It is canceled
+				// It is canceled if transaction died before answer
 				dtx.setState(sip.DialogStateEnded)
 			}
 		})

sip/transaction_server_tx_fsm.go

@@ -314,6 +314,7 @@ func (tx *ServerTx) actCancel() fsmInput {
 	}
 	tx.log.Debug().Msg("Passing 487 on CANCEL")
 	tx.fsmResp = NewResponseFromRequest(tx.origin, StatusRequestTerminated, "Request Terminated", nil)
+	tx.fsmErr = fmt.Errorf("Transaction canceled") // For now only informative
 	return server_input_user_300_plus
 }