3G-324M Toolkit

An essential development tool for a wide range of 3G products

The 3G-324M Stack is an essential development tool for a wide range of 3G products, handsets and servers. The 3G-324M Stack has several important add-ons focused on the special needs of specific product types, making it the most versatile stack for any kind of application. The 3G-324M Stack comes built-in with fast call setup time implementations (WNSRP and MONA) which are based on Softil patented technologies.

Key highlights

Optimized footprint and memory usage

Highly optimized for memory usage, making it an ideal choice for mobile and embedded platforms, where there are severe memory constraints.

Feature Rich

Includes H.324 Annex K (MONA), WNSRP, Session Reset, Dual Video and many other features.

Formerly Radvision 3G-324M Toolkit

The 3G-324M Stack is used to develop

3G handsets and 3G servers.


The 3G-324M stack includes a set of APIs to develop multimedia communication solutions for 3G servers and handsets. It can also be used to develop multimedia-based solutions for UMTS and TD-SCDMA networks. Softil’s 3G-324M Toolkit delivers very high performance with a small memory footprint.

The 3G-324M stack is designed for video telephony applications over live circuit switch (UMTS, TD-SCDM) networks. The 3G-324M architecture is divided into several modules and Add-ons.

Key highlights

User Application

The user application uses the Call Manager of the Stack to open calls and deal with video and audio channels. The user application is also responsible for dealing with the actual codecs that will be used in the call. A sample user application is provided with the Toolkit.

Call Manager

The Call Manager is responsible for the creation and destruction of calls. The Call Manager is actually the “glue” between the H.245 Control object of the call and the H.223 Multiplexer/Demultiplexer object of the call. This module is also responsible for sending and receiving data operations over the logical channels after the H.245 module has completed establishing them.

Codec‘s Interface

Once the call is connected, the media need to be set for sending and receiving Audio and Video and opening Media channels. This module includes the relevant interfaces that need to be used to integrate the media into the 3G-324M and allow the correct flow of the media in the call.

H.245 Layer

The H.245 Module is responsible for performing the H.245 procedures and for opening and closing the logical channels. The Capabilities Exchange and Master/Slave Determination procedures are the first to be performed during the H.245 control process.

H.223 Layer

the H.223 Multiplexer/Demultiplexer module is responsible for communication with the modem. This module replaces the TCP/IP interface used in VoIP protocols. The H.223 module has two sets of interfaces: APIs for the various channels (H.245 and codecs). APIs for the modem interface.

PVT Layer

The PVT (Program Value Tree) is a data structure of the Stack that contains instances of the messages. The Stack generates some of the messages, others are received from remote hosts on the network, and some you can create using the PVT functions also provided with the API of the Toolkit.

PST (Program Syntax Tree)

is a data structure used by some of the Softil Toolkits that contains data about the ASN.1 message syntax. The PST is a read-only database that is created by the ASN.1 compiler. The PST functions provided with the API of this Toolkit enable you to navigate through the PST and retrieve its data.


The baseband application layer is responsible for integration with the modem of the device and allows 3G-324M communication over circuit switch networks.

Auto Caps Add-on

This add-on module handles capability negotiation and channel opening. The application needs only to state its capabilities and the H.245 AutoCaps add-on will negotiate the best channels to be opened for the call, while managing any conflicts that might occur during the process. For mobile phone applications, this reduces the hassle of having to deal with all channel conflict scenarios. The H.245 AutoCaps add-on module requires the GEF add-on.

GEF Add-on

The new Generic Extensibility Framework (GEF) add-on module contains simple APIs for codecs defined by H.245 GEF, such as MPEG-4, AMR, H.264, and H.239.

3G-324M Features

Source code with flexible API for maximal control Documentation and samples for rapid kick-start Proven robust performance and worldwide interoperability Open source-free Multiple OS support and flexible OS portability (such as Windows Mobile/Windows Phone, Android, Windows XP, Linux and more…). Market leading performance and scalability Low footprint High maintainability and professional customer support.

The 3G-324M stack comes with:

  • Full source code
  • Complete source code
  • Sample application
  • Full documentation: Programmer guide, Reference guide, Special GCF and Interoperability guide, and Porting guide (for unsupported operating systems)
  • Training Version upgrades Professional customer support
  • Turnkey solutions (upon request)
  • Porting services (upon request)
  • Access to all sections in the 3G-324M community site
Standards Conformance
The 3G-324M Stack supports all of the latest standards required to build Video Telephony solutions. These include: H.324, including Annex K (MONA) H.223 H.245 version 13 H.241 H.239 H.249 3GPP TS 26.110 V6.0.0 (12/2004) 3GPP TS 26.111 V6.1.0 (12/2004) 3GPP TR 26.911 V7.1.0 (09/2006) 3GPP TS 27.007 V6.8.0 (03/2005) ISDN CAPI 2.0
All Softil products and solutions take into account interoperability issues between disparate networks, protocols and devices. The 3G-324M stack has been thoroughly tested for full interoperability. You are also invited to enjoy the IMTC blog, where Softil contributes regularly on 3G-324M issues.

Softil 3G-324M Toolkit Data Sheet