Embedded Windows CE VOIP Developers Kit is your embedded telephony solution for developing software/hardware to enable device to device phone calls using SIP/H323 phone right at the electronics level. The design is based on Hybrid Combination of RFC SIP Protocol and Windows RTC and is today successfully ported to Windows CE/Pocket PC/Smart Phone. With a memory overhead of 3 MB - the telephony engine very well fits the needs of engineers looking for porting highly advanced SIP or H323 PROTOCOL to the embedded world. Research Lab further enables you to create production level voip system with following tools
Available : A complete multi-lingual speech synthesis workbench using Festival TTS
Available: A complete multi-lingual speech recognition workbench using ISIP ASR
Available: Speaker Verification (with two algorithms)
Ported to Embedded : Edinburgh Speech Tools Library
Ported Open DSP Library : libsnd.dll
Make DEVICE-PC, PC-DEVICE, PC-Phone, or phone-phone calls or create Instant Messaging (IM) sessions over the Internet on Windows CE
Both voice and video calls can be established on DEVICE-DEVICE calls. Presence information on a list of contacts is also supported. Application sharing and whiteboard can be added to enhance the communication capabilities of any type of session
IP-Address or DNS based direct connectivity
Gateway Specification with/without Login
Gatekeeper Specification with/without Login
Proxy/Firewall NAT support with Realm Login
Voice/Ring Volume Adjustment [i.e. for Registered Users]
Save a conversation to a wave file [i.e. for Registered Users]
Create a Mobile Answering Machine
Create a Mobile Interactive Voice Response
Create a Mobile Professional Call Center 
VOIP using an IP Phone [registered users only]
Embedded IP Phone ----- Ethernet ----- Router ---- Internet ---- VOIP Service Provider