H.323 Audio/Visual Communications Stacks

H.323 is the ITU-T protocol enabling voice, data, and video conferencing communications over packet-based systems. Aricent’s H.323 Stack and other Voice over Packet (VoP) software products provide a complete set of building blocks for quickly developing next-generation network solutions that meet carrier-class requirements for redundancy, scalability and reliability.

H.323 is central to VoIP solutions and may be integrated into products such as:

The H.323 stack can be used for building products such as:

• H.323 Gatekeeper
• Multimedia gateways
• Enterprise packet-enabled PBX solution
• Carrier grade softswitches, call agents etc.
• H.323 Multi-point conference unit
• H.323 Test tools and analyzers
• Softphones and IP phones
• Residential CPE devices

Aricent’s Companion Lifecycle Services

The majority of Aricent’s products are delivered with tailored combinations of our Lifecycle Services, including Global Innovation and Design, Product Development, Testing and Certification, Network Engineering, Maintenance and Support, and Business Operations and Systems Integration. Aricent’s engineers and consultants have successfully completed thousands of services engagements globally using flexible delivery models ranging from on-site to off-shore. Aricent’s services offer deep communications domain expertise, cost and time efficiencies, quick ramp up and contemporary commercial engagement models including end-to-end commitments. 

Components

H.225 Call Signaling

• Conforms to version 3
• Supports Registration, Admission and Status (RAS)
• Based on Q.931
• CLIP/CLIR support
• Enables maintenance and re-use of connections
• Provides alternate GK support

H.245 Control Protocol

• Conforms to version 7
• Provides H.245 Tunneling
• Enables switching to a separate H.245 connection
• Supports Fast-Start
• Overlap Sending

H.235 Security Framework

• Conforms to version 2
• Supports Baseline Security Profile (BSP)
• Provides Backend Server Support (BESS)
• Enables RADIUS mode
• Supports Default mode

H.450.x Supplementary Services

• Call Transfer (H.450.2)
• Call Diversion (H.450.3)
• Call Hold (H.450.4)
• Call Waiting (H.450.6)
• Message Waiting (H.450.7)
• Call Intrusion (H.450.11)

RTP/RTCP

• Supports Annex A of H.225.0v3
• Compliant with RFC 1889A

Annexures

• Conforms to Annex E
• Supports H.225.0 Annex G

Features

• Conforms to versions 3, 2 and 1
• Fast connect and H.245 tunneling
• Overlapped sending
• Support for a redundant gatekeeper
• APIs available for easy development of network elements like:

• Gatekeeper
• Gateway
• MCU
• Terminals

• Support for Baseline Security Profile (H.235)
• MT safe
• Modular and portable
• Supports distributed and scalable architecture
• Well-defined and documented interfaces to the stack (APIs)
• Provides a highly efficient OS library
• Test/Debugging interface

Interoperability

• Backward compatible with H.323 Ver 1 and Ver 2
• Conforms to IMTC VoIP Forum IA 1.0
• Interoperates with:
  • Microsoft's NetMeeting
  • Vocaltec IP terminal application
  • Cisco's AS5300 VoP Server
  • RadCom Bulk Call Generator
  • Other leading industry implementations

Conformance to AAPE

• Modularity
  • Layered architecture
  • Stack data structures are hidden from the outside world
  • Compile time exclusion of functionality
• Multiple configuration options - multi-tasking/single-thread and message-based/functional interface
• Porting effort restricted to modules involving operating system interfaces; error handling/reporting, external interfaces
• Customization of task architecture, custom event handlers and communication between modules
• Debugging support

Deliverables

• Source Code for H.323 stack
  • OS wrappers for: Sun Solaris, VxWorks, Linux, WinNT
• User Documentation
  • Application Programmers Interface
  • Warranty and optional annual support plans
  • Training and on-site consultancy
  • Turnkey integration and porting services