Mixed Media Interactive Communication
Presented by...
SIPKnowledge, Inc. 
Motivation:
Dave and George are best friends. They hang out together a lot. Sadly one day Dave has to move to a different city. Seemingly they can still chat over the phone. However Dave is mute and George is deaf… Is their friendship doomed now?
Feature:
A SIP client (either a soft phone or real phone), might be capable of supporting mixed media streams. The user of such a device can instruct it (either in general of for a particular call) to use for example text for outgoing communication and audio for incoming (and vice versa) one.
How this can be accomplished:
The following scheme illustrates how this can be accomplished.

SIPKnowledge, Inc. 
SIPKnowledge pursue research combined with actual product (and standard) work and provide its outcome in a shape of self paced eLearning courses, seminars (on-site training) and actual products. The courses and seminars offer information/self-training on SIP, IP telephony (VoIP) and 3G IMS. Products include:
- Consulting
- SIP/IMS training courses
1. SIP Illustrated - SIP eLearning course
2. 3G IMS Illustrated - 3G IMS eLearning course
- SIP developers aid tools
1. SIP RFC (3261) navigator and clarifier tool
http://www.sipcenter.com/goto/sipcenter-sipknowledge