GAO V2oIP Integrated Solutions
GAO Research offers complete integrated solutions suitable for any V2oIP application. We provide comprehensive, reliable software solutions, customized and refined to meet specific customer needs. These V2oIP integrated solutions are based on GAO's own developed technology, including V2oIP stacks, audio and video codecs, and telephony modules. Seamless integration is achieved for all elements through extensive testing and refinement, thus all customers benefit from our all-in-one packaged solution. Like all GAO products, our V2oIP Integrated Solutions will benefit from our reputation of unparalleled customer support.
GAO uses its own high performance, versatile and field-proven Voice and Video over IP protocol H.323 and SIP stacks, and delivers the best-in-class Voice and Video over IP software solutions.
SIP vs. H.323
Both H.323 and SIP are multimedia conferencing protocols, which include features for voice, video, and data conferencing, for use over packet-switched networks.
However, H.323 is not just an individual protocol. It is a complete implementation of a suite of protocols, which define every component of a conferencing network. The elements of H.323 include Terminals, MCUs (multipoint control units), Gateways, Gatekeepers, and other feature servers. H.323 defines a framework of how these various elements of a conferencing network function together. H.323 specifies everything including all its media codecs and how they are carried as packets in RTP or RTCP. H.323 specifies the use of Q.931 for call setup, H.225 for call signaling, and H.245 for exchanging terminal capabilities and the creation of media channels.
In contrast, SIP is a simple protocol, which specifies only what is necessary as a signaling protocol. For example, SIP can work with RTP, but does not mandate its use. SIP is mainly responsible for creating, modifying and terminating conference sessions between two or more participants. SIP could be considered as an equivalent to the Q.931 and H.225 components of H.323, which are components specified for call setup and call signaling. SIP provides its own reliability mechanism and thus is independent of reliability issues of the underlying network. SIP is typically used over UDP or TCP. Since SIP is independent from its underlying protocols and architecture, along with its simplicity, it has become a popular alternative to H.323 and is quickly being endorsed by the industry.
GAO SIP Stack
GAO implementation of the SIP protocol stack complies with IETF RFC2543 (March 1999), and is modified as per the latest updates of the standard. The stack offers carrier class performance and functionality to manage the fundamental connection between the call-originating and call-terminating parties.
GAO unique, multi-layered API makes it easy to build simple applications as well as complex implementations.
GAO H.323 Stack
GAO implementation of the H.323 protocol stack complies with ITU-T Recommendation H.323 (1998) which references Recommendations H.225.0 (1998) and H.245 (1998). It supports all H.323 components: terminals, gateways, MCUs and gatekeepers.
GAO H.323 stack supports:
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Q.931 - call setup
H.225 call signaling
H.245 - exchanging terminal capabilities and creation of media channels
RAS - registration and admission control
RTP/RTCP - sequencing audio and video packets
Media Interface for Audio/Video control
GAO implementation also provides these features:
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High and Low Level API's
Single and multi-session implementations
Multi-threaded, flexible, highly interoperable
Well-documented codes
Major operating systems supported with pre-ported interface
GAO H.323 and SIP Integrated Solutions for V2oIP
The majority of today’s existing IP telephony products rely on the H.323 protocol. However SIP is quickly emerging as the alternative and replacement of H.323 with many vendors developing new products. To address different markets, it is important to provide solutions for products built for both the H.323 and the SIP protocols.
GAO offers 3 unique V2oIP Integrated Solutions: H.323-only, SIP-only, and the H.323 + SIP solution.
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Based on the H.323 protocol stack, this modular platform provides an integrated solution which includes call control and management as specified by H.323, all media codecs, the RTP/RTCP, and additional telephony services including the use of T.120 for data conferencing and T.38 to provide fax relay capabilities.
Based on the SIP protocol stack, this modular platform provides an integrated solution which uses SIP call control and management, a set of media codecs, and additional telephony services including T.38 fax relay capabilities. The SIP solution does not specify the use of RTP/RTCP as required for H.323 protocol.
Including both the H.323 and SIP stack, this modular platform provides an integrated solution, which can use either H.323 or SIP for call control and management. It is a combination of the H.323 and SIP solutions. When requiring H.323-only or SIP-only applications, the H.323 or SIP call control modules that aren抰 in use can be removed to reduce memory footprint. SIP advanced services can be used in parallel with both SIP or H.323 audio/video conferencing.
| 1 - GAO V2oIP Integrated Solution using H.323 Stack | 2 - GAO V2oIP Integrated Solution using SIP Stack |
| H.323 Implementation | SIP Implementation |
|---|---|
| GAO H.323 Stack – Q.931 Call setup, H.225 Call signaling, H.245 Exchanging terminal capabilities and creation of media channels, RAS registration and admission control. | GAO SIP Stack – Amongst others, the stack supports SIP call control and management, SIP audio conferencing and video conferencing, and network retransmissions management. |
| Packet Protocols (RTP, RTCP, SIP, SDP) – selected from GAO extensive communication software library, these implementations of protocols are tuned to integrate seamlessly with our media codecs to provide superior and reliable data transfer within the session and transport layers. | |
| Codecs API and Audio/Video Codecs – GAO makes use of our own comprehensive collection of reliable vocoders and audio codecs, supporting all G.7x standards. GAO also supplies all video codecs, H.261, H.263, H.264, MPEG2, and MPEG4. | |
| GAO Telephony Services - Includes the T.120 Data Conferencing module required in the H.323 protocol. Along with the T.38 Fax Relay module, GAO uses our extensive list of telephony modules providing services such as AGC, CID, CP, DTMF, LEC, EC (digital), VAD, CNG, and AEC. | |
| H.323 + SIP Implementation |
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| Includes both the H.323 Stack and the SIP Stack. – can use either H.323 or SIP for call control and management. When addressing H.323-only or SIP-only applications, the H.323 or SIP call control modules which aren't in use can be removed to reduce memory footprint. SIP advanced services can be used in parallel with both SIP or H.323 audio/video conferencing. |
Possible H.323 + SIP configurations:
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| DSPs, MICROPROCESSORS, RTOS & APPLICATIONS |
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| Texas Instruments Inc. xDAIS compliant and available for TMS320C5000 & TMS320C6000 families of DSPs. |
| Analog Devices ADSP-BF53x(Blackfin), ADSP-21xx, SHARC CEVA DSP Cores, Motorola 56800/E, Infineon's Carmel. |
| ST20 Core, ST40 Core, Intel XScale based processors & StrongARM, ARM, MIPS, SuperH, Trimedia, Power PC, ARC, Tricore, Mitsubishi, SPARC |
| Pentium, fixed point & floating point C |
| GAO's software integrates with MP3, JPEG, MPEG, TCP/IP and most popular RTOS and Web browsers. |
