Adding SERVICE method (#1284)

* adding SERVICE method

* changing content-type

* adding comment

Author: priyendumori

src/core/SIP/SIPConstants.cs

@@ -1,4 +1,4 @@
-//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
 // Filename: SIPConstants.cs
 //
 // Description: SIP constants.
@@ -385,6 +385,7 @@ public enum SIPMethodsEnum
         MESSAGE = 15,       // RFC3428.
         PRACK = 16,         // RFC3262.
         UPDATE = 17,        // RFC3311.
+        SERVICE = 18        // Not defined in RFC. But there are reported uses of this method. Example: https://learn.microsoft.com/en-us/openspecs/office_protocols/ms-pres/258ef387-09f9-416d-b7a8-3ec20f4d9944
     }
 
     public static class SIPMethods
@@ -674,4 +675,4 @@ public static List<SIPExtensions> ParseSIPExtensions(string extensionList, out s
             return knownExtensions;
         }
     }
-}
+}

test/unit/core/SIP/SIPRequestUnitTest.cs

@@ -1557,6 +1557,35 @@ public void GenerateDiversionHeadersOnToStringTest()
             logger.LogDebug("-----------------------------------------");
         }
 
+        [Fact]
+        public void ParseSERVICEUnitTest()
+        {
+            logger.LogDebug("--> " + System.Reflection.MethodBase.GetCurrentMethod().Name);
+            logger.BeginScope(System.Reflection.MethodBase.GetCurrentMethod().Name);
+
+            string sipMsg =
+                "SERVICE sip:[email protected] SIP/2.0" + m_CRLF +
+                "From: <sip:[email protected]>;epid=85D7DC3A61;tag=ddfb74b87" + m_CRLF +
+                "To: <sip:[email protected]>" + m_CRLF +
+                "Call-ID: fc2gbd6449264ecfbe9rbf23f11f7be9" + m_CRLF +
+                "CSEQ: 73 SERVICE" + m_CRLF +
+                "CONTACT: <sip:[email protected]>" + m_CRLF +
+                "Via: SIP/2.0/UDP 10.0.0.1:5060;branch=yxxxcvvvbbbnnmm1;" + m_CRLF +
+                "Max-Forwards: 67" + m_CRLF +
+                "Content-Length: 5" + m_CRLF +
+                "CONTENT-TYPE: text/text" + m_CRLF +
+                "USER-AGENT: Agent" + m_CRLF + m_CRLF +
+                "abcd" + m_CRLF;
+
+            SIPMessageBuffer sipMessageBuffer = SIPMessageBuffer.ParseSIPMessage(Encoding.UTF8.GetBytes(sipMsg), null, null);
+            SIPRequest serviceReq = SIPRequest.ParseSIPRequest(sipMessageBuffer);
+
+            Assert.True(serviceReq.Method == SIPMethodsEnum.SERVICE, "The SIP request method was not parsed correctly.");
+            Assert.True(serviceReq.Header.CSeqMethod == SIPMethodsEnum.SERVICE, "The SIP request CSeq method was not parsed correctly.");
+
+            logger.LogDebug("-----------------------------------------");
+        }
+
     }
 
 #pragma warning restore SYSLIB0021