Windows CE Networking Team WebLog

If you install the recent CE 5.0 QFE's AND try to build Kerberos.dll, you will run into a bug that unfortunately was introduced in this QFE. Check out customer thread alerting us to it here . Short summary is that customer is seeing: "Warning: Unable...

There are many scenarios where inspecting incoming SIP messages for custom headers is useful. Many servers add their custom headers for custom functionalities like custom ring tones, shared line functionality, privacy, etc. and hence having the ability...

Adding custom SIP headers using RTC, in CE 6.0 R2 release. In CE 6.0 R2, RTC now supports the capability of adding custom headers to outgoing REQUEST messages, for RTC sessions and RTC subscriptions. Here is how once can do it. After CE 6.0 R2...

I just checked out the blog and realized it's been ~1.5 months since the last post, which is lame. I have a dilemna since I've run out of tricks/advice that I think are useful, for now at least. I can either write nothing or do something random, like...

If you try to build svsutil.hxx on certain versions of the Windows Mobile SDK, you may run into build errors. I know it's on WM5 SDK at a minimum, I don't know about WM6 SDK. The error you'll see will complain about the methods int operator==(int iBit...

RTC 1.5 can be restricted to use only certain types of interfaces (Wifi, Ethernet, etc.) on Windows Mobile devices. Same restriction cannot be applied on Windows CE, as RTC uses connection manager functionality to do that, which is not available on Windows...

RTC 1.5 (CE 6.0 R 2 release) supports Point to Point Video calling. However, the stack does not ship any built-in video codecs. Instead it supports a pluggable video codec architecture through which, one can add their own video codecs. Below are the...

Sample code for local audio mixing to achieve 3 way/N way calling. In CE 6.0 R2 release, RTC 1.5 started supporting local audio mixing. Local audio mixing can be enabled by using the flag RTCIF_ENABLE_GLOBAL_MEDIA_MIXING during RTCClient object initialization...

Following are the new features in RTC 6.0 R2 release: 1. Local audio mixing capability (enabling 3 way VOIP calling) 2. Point to Point Video Calls 3. Pluggable Video Codec capability 4. Ability to inspect SIP headers for certain SIP messages 5. Ability...

I recently wrote about the recent DCOM Remoting Addon pack being available . Since I'm running out of things to write about, I'll explain the geeky details of how the DCOM addon pack came to be. This post is for the very bored only or those who are...

As I wrote here , in Windows CE 6.0 we removed DCOM remoting - that is the ability to create and host COM objects across a network. We did this due to security. Our DCOM is built on NT4 vintage code and there was no way we could patch up our implementation...

My "stuff to blog about" well has pretty much run dry, as anyone who follows this blog knows. Fortunately there's always a customer running into something that I've never thought about something to inspire me. Bad for the poor customer hitting the issue...

Background A number of customers on a recent WM6 versions have run into a problem where GPSGetPosition returns ERROR_INVALID_PARAMETER always, even on apps that worked fine in the past. The newsgroup thread is here . The device I've reproed and tested...

While tracking down some memory corruption issues, I noticed in one function that a parameter on the stack was always getting set to the value 2, even though it was a pointer. I could see it turn red in the memory view window as its value changed. I thought...

Hi, my name is Harish Srinivasan. I work in the Windows CE Core Networking team. I own IPsec, IKE and several other networking components.

The Windows CE serial port based networking components have an historical affinity for the RS232 Carrier Detect (CD) signal. A key feature of Windows CE 1.0 was automatic synchronization of email and contacts when docked (ActiveSync). The device needed...

RTC 1.5 supports privacy for SIP. It implements a subset of RFC 3323, RFC3324, RFC 3325 and can create messages that do not divulge personal identity information. Windows CE and WM6 has the following privacy constants describing different privacy policy...

This blog explains the different components that contribute to the audio delay in a VOIP call, and then discusses RTC's VOIP delay numbers. When any VOIP call made between any 2 VOIP entities, the end-to-end delay for the VOIP call can be categorized...

RTC uses standard based SIP signaling and RTP/RTCP media streams to provide VOIP functionality. To verify this, I carried out a little experiment to see if RTC works with existing VOIP services like Vonage. Guess what? It did :). Here are the steps...

One of the questions that I've seen asked, time and time again, is "How do you disable the username and password dialog that is generated by such and such Microsoft provided component?" The answer to all great questions is that it usually depends....

There were many queries about using RTC on Windows Mobile platform. With this blog, I will try to clarify on which platforms RTC is available and supported. So far, RTC has always shipped as a part of the general embedded CE release. It is supported...

I wrote the first PCMCIA driver for Windows CE in 1995. At the time, CE had not been ported to the PC, so we had to rely on reference platforms and prototypes to debug. Some problems were not software related. The first Windows CE reference platform...

Sometimes on the newsgroups I tell an OEM that's having problems with some component to "Drop DEBUG DLL foo into the release directory and turn on full DEBUGOUT and get me the output." Most Windows CE components have pretty good debug-time logging so...

When an EAP extension succesfully completes authentication, it can fill in the PPP_EAP_OUTPUT pUserAttributes field with MPPE key information for use by other networking components. For example, RAS can use those keys for data encryption, and WPA/WPA2...

Windows CE does not support the time.h structures, as I blog about here . Fortunately Chris Tacke at OpenNETCF has created a free library to do this, which is available here , in order to make porting easier to CE. (If you're not porting code you should...