Support for tel uri

sip/parse_uri.go

@@ -62,6 +62,18 @@ func uriStateSlashes(uri *Uri, s string) (uriFSM, string, error) {
 
 func uriStateUser(uri *Uri, s string) (uriFSM, string, error) {
 	var userend int = 0
+	// For scheme tel RFC3966 use other flow for parsing
+	// https://datatracker.ietf.org/doc/html/rfc3966#section-3
+	if uri.Scheme == "tel" {
+		for i, c := range s {
+			if c == ';' {
+				uri.User = s[:i]
+				return uriStateUriParams, s[i+1:], nil
+			}
+		}
+		uri.User = s
+		return uriStateUriParams, "", nil
+	}
 	for i, c := range s {
 		if c == '[' {
 			// IPV6

sip/parse_uri_test.go

@@ -214,3 +214,37 @@ func TestParseUriIPV6(t *testing.T) {
 		assert.Equal(t, "user", uri.User)
 	})
 }
+
+// Examples from https://datatracker.ietf.org/doc/html/rfc3966#section-6
+// and https://datatracker.ietf.org/doc/html/rfc4694#section-6
+func TestParseTelUri(t *testing.T) {
+	t.Run("schema tel global", func(t *testing.T) {
+		uri := Uri{}
+		str := "tel:+1-201-555-0123"
+		err := ParseUri(str, &uri)
+		require.NoError(t, err)
+		assert.Equal(t, "", uri.Host)
+		assert.Equal(t, "+1-201-555-0123", uri.User)
+	})
+
+	t.Run("schema tel local", func(t *testing.T) {
+		uri := Uri{}
+		str := "tel:7042;phone-context=example.com"
+		err := ParseUri(str, &uri)
+		require.NoError(t, err)
+		assert.Equal(t, "", uri.Host)
+		assert.Equal(t, "7042", uri.User)
+		assert.Equal(t, "example.com", uri.UriParams["phone-context"])
+	})
+
+	t.Run("schema tel local with context", func(t *testing.T) {
+		uri := Uri{}
+		str := "tel:+1-202-533-6789;npdi"
+		err := ParseUri(str, &uri)
+		require.NoError(t, err)
+		assert.Equal(t, "", uri.Host)
+		assert.Equal(t, "+1-202-533-6789", uri.User)
+		assert.NotEmpty(t, "example.com", uri.UriParams["npdi"])
+	})
+
+}

sip/uri.go

@@ -75,11 +75,17 @@ func (uri *Uri) StringWrite(buffer io.StringWriter) {
 			buffer.WriteString(":")
 			buffer.WriteString(uri.Password)
 		}
-		buffer.WriteString("@")
+
+		if uri.Scheme != "tel" {
+			buffer.WriteString("@")
+		}
+
 	}
 
 	// Compulsory hostname.
-	buffer.WriteString(uriIP(uri.Host))
+	if uri.Host != "" {
+		buffer.WriteString(uriIP(uri.Host))
+	}
 
 	// Optional port number.
 	if uri.Port > 0 {
@@ -133,8 +139,10 @@ func (uri *Uri) Addr() string {
 	}
 
 	addr := uri.Host
-	if uri.User != "" {
+	if uri.User != "" && uri.Scheme != "tel" {
 		addr = uri.User + "@" + addr
+	} else if uri.Scheme == "tel" {
+		addr = uri.User
 	}
 	if uri.Port > 0 {
 		addr += ":" + strconv.Itoa(uri.Port)