Long session setup times are recognized as one of the limiting factors for consumer acceptance of video telephony services. Annex K of H.324 contains a range of techniques to substantially improve session setup times, reducing call setup negotiation time to the equivalent of a voice call.
Dilithium has pioneered the development of video telephony call setup time improvements and techniques.
H.324/Annex K - MONA (Media Oriented Negotiation Acceleration)
Dilithium played a key and leading role in the definition and the standardization of ultra fast session setup acceleration techniques for 3G videotelephony (3G-324M).
Dilithium's AnswerFast® Technology Suite forms the basis of the ITU-T H.324 Annex K, also known as MONA.
MONA consists of an algorithm that allows 3G terminals to exchange their preferences early and to start media exchange within 1/2 round trip.
This standard significantly improves the videotelephony customer experience by reducing the session setup time to around 1 second, comparable to voice calls.
The following documents were contributed in the standardization process for MONA.
2004
Fast session setup extensions to H.324 - Contact Dilithium or the ITU-T
WNSRP (Windowed Simple Retransmission protocol) is a H.245 transport improvement technique, and an analogue to the technique used by the Transmission Control Protocol (TCP) which introduces a transmission window for the (W)NSRP messages sent by a terminal.
WNSRP was originally proposed by Motorola to the IMTC 3G-324M activity group in 2003. WNSRP was standardized in the ITU-T Recommendation H.324 and accepted into the 3G-324M standard by 3GPP in 2005.
The transmission of WNSRP H.245 messages allows for multiple independent messages to be sent without acknowledgment and more efficient utilization of bandwidth for each of the messages. WNSRP is better described as a “Transport Layer Error Resiliency Modification” to avoid confusion regarding the level of session setup time reduction achievable.
The following documents were contributed in the standardization process for WNSRP.
2003
Transmission of Multiple ARP Frames in NSRP Mode - Contact Dilithium or the IMTC
2004
Windowed NSRP (WNSRP) Proposal - Contact Dilithium or the IMTC
