INT specialists have developed a full set of hardware and software tools for creation of corporate IP telephony system. Use of a unified set of technical tools allows significantly simplify implementation and further maintenance of the system.

Compared to traditional telephone systems INT IP telephony and video telephony systems implementation allows:

• significantly extend the range of services provided to subscribers;
• increase efficiency of joint operation of subscribers remote from each other geographically;
• reduce the expenses for increasing the number of subscribers to be served in future;
• reduce the expenses for long-distance and international calls;
• simplify interaction between remote company offices.

IP telephony and video telephony network deployment does not require laying additional telephone lines. Data transfer is fulfilled via local computer network. Communication between remote subsidiaries or offices as executed by means of VPN.

With the help of specialized gateways the existing telephone lines, PBX and POTS telephone can be connected to IP telephony system. It is possible to organize interaction with PSTN and organization of calls to city telephone numbers.

IP telephony system developed by INT is compatible with IP telephony systems of other vendors.

MAIN SERVICES PROVIDED BY IP TELEPHONY SYSTEM:

• Voice telephone communication;
• Video telephone communication;
• Text messages and files exchange;
• Subscribers status presence;
• Voice and video conferencing;
• Call redirect;
• Call transfer;
• Control of subscribers access to communication services;
• Address book;
• Providing callers id.

MAIN DIFFERENCES FROM TRADITIONAL TELEPHONE NETWORKS:

• Automatic calls commutation in case of calling inside the company and between remote subsidiaries and besides in case of connection with PSTN subscribers;
• Provision of the whole set of communication services with the help of unified equipment set and software;
• Automatic control of subscribers access to communication services and setting individual subscribers rights;
• Speech quality equal to cell communication quality;
• Voice menu used for setting the parameters of services provision;
• Absence of expenses for laying new telephone lines;
• Provision of video telephony services.

POSSIBILITY OF INTEGRATION WITH COMMUNICATION FACILITIES USED:

For IP telephony system implementation existing local networks and telephone lines can be used. Connection to telephone line and POTS telephone system is fulfilled by means of special gateways also developed by INT.

IP telephones of other vendors using SIP signaling protocol can be connected to INT IP telephony system.

TECHNICAL FACILITIES OF IP TELEPHONY DEVELOPED BY INT:

INT specialists have developed a full set of equipment and software for corporate IP telephony networking. Usage of a unified set of technical facilities allows significantly simplify system implementation and future maintenance.

Main IP telephony system components:

• Atom Shell IP telephony system server - specialized application providing calls commutation, signals transformation, communication services access control. Operation is based on industrial PC;
• Atom Terminal program telephone - user application allowing the subscriber to get access to IP telephony services.
• Atom Gate telephone network gateway - facility providing interfacing of IP telephony system and POTS telephone lines and telephones installed at subscribers working places through these lines.

Equipment has a unified management interface and administrative user interface which allow speeding-up staff training and simplify implementation, setting and maintenance of the system.

Depending on a working place technique a subscriber can get access to the following set of services:

* - for subscribers using Atom Terminal.

ATOM TERMINAL PROGRAM TELEPHONE

Atom Terminal program telephone is a facility for subscribers’ access to IP telephony services. Atom Terminal is installed and functions on subscribers PC connected with Atom Shell via local network.

Main Functions:

• Voice telephone communication;
• Video telephone communication;
• Text messages exchange;
• Files exchange;
• Voice conferencing;
• Address book (list of contacts) with subscribers status indication (presence);
• Calls history recording and scrolling;
• Hold and transfer;
• Services provision management;
• Talks recording.

Specifications:

• High quality of speech transferred;
• Built-in mechanisms of adaptive acoustic echo cancellation (AEC), automatic gain control (AGC), noise cancellation (NC);
• Up to 3 simultaneous connections, one of which can be active;
• Voice activity detection (VAD) and silence suppression (SS)
• Comfort noise generator (CNG);
• Image dimensions when operating in video telephone mode: CIF 352x288, QCIF 176x144, 4CIF 704х576;
• Audio codecs: iLBC (RFC 3951 - 13,3 kbits /sec); G.711, G.728;
• Video codecs: H.263;
• Signaling protocol: SIP 2.0 (RFC 3261);
• DTMF transfer: SIP - INFO method (RFC 2976).

Requirements to Computing Platforms:

• Processor with tact frequency not less than 1 GHz, supporting MMX instructions set;
• OS: Linux/X11 or Windows family OS;
• Video adapter and monitor — support of SVGA video mode, display resolution not less than 1024х768 pixels.

Examples of Application:

Atom line IP telephony and video telephony means can be used both in desk-top office systems and in complexes and systems with especially trying operation conditions.

ATOM SHELL IP TELEFONY SYSTEM SERVER

Atom Shell provides calls servicing management, realizes signaling protocols and control of access to communication services.

Atom Shell server architecture corresponds to IPCC consortium requirements to software switches architecture and realizes all the functional levels described in the correspondent normative documents:

• Call and signaling servicing management level - manages main IP telephony system elements. Involves media gateways controller and calls processing controller.
• Services and applications level - realizes services management in the network.
• Transport level - answers for efficient usage of communication channels.
• Operation management level - supports subscribers and services management functions, maintenance, security management and other operation tasks.

Main Functions:

• Provision of subscribers with access to IP telephony services;
• Calls commutation and forwarding and transfer between subscribers on their initiative;
• Organization of conversations in conferencing mode;
• Logging of calls and conversations recording;
• Automatic management of communication channel bandwidth loading;
• Subscribers servicing in accordance with their priority, provision of communication services in accordance with available at the moment resources;
• Realization of voice menu for setting the parameters of services provision.

Requirements to Computing Platforms:

• Industrial or personal computer, IBM PC compatible:
• Processor:  Intel-compatible with tact frequency not less than 2 GHz (Core 2Duo with tact frequency more than 2.2 GHz is recommended);
• Operation memory volume: 1 Gb, not less than 2Gb is recommended;
• Hard drive volume: 20 Mb for software installation, not less than 100 Mb of free space for log files of software operation;
• OS: OS of Linux family.

Specifications:

• Speed of calls processing (attempts of connection per second): 15 cps;
• With RTP - proxy:
  • Number of simultaneous connections: up to 500;
  • Number of simultaneous trilateral (three subscribers) conference calls: up to 20.
• Without RTP - proxy:
  • Number of simultaneous connections: up to 40000.

ATOM GATE TELEPHONE NETWORK GATEWAY

Atom Gate telephone network gateway allows subscribers to get access to IP telephony services by means of POTS telephones. In this case subscribers get an opportunity to use voice telephone communication, telephone conferencing, call forwarding and connection transfer services.

Design:

Atom Gate is produced in standard dimensions housings to be 19” rack-mounted, housing height — 1U. Every device allows connecting up to 32 subscriber telephone lines.

Specifications:

• Number of connected subscriber telephone lines: 32;
• Number of lines simultaneously used for speaking: up to 16;
• Telephones connection via two and four wire lines;
• State diagnostics and setting: remote, through web interface;
• Connection to IP telephony server: Ethernet100Base-FX (optical interface);
• VAD (voice activity detection), SS (silence suppression);
• Built in mechanisms of line echo cancelation (LEC), automatic gain control (AGC);
• Comfort noise generator (CNG);
• Support of signaling SIP 2.0 (RFC 3261);
• Audio codecs: iLBC (RFC 3951 - 13,3 kbit/sec); G.711, G.728;
• DTMF transfer: by SIP method INFO (RFC 2976)
• Device, subscriber ports and lines state monitoring (permanently connected subscriber, power circuit closure);
• Dimensions: 480x44x450 mm;
• Power supply parameters: AC network power supply, 220 V (50 Hz);
• Watt consumption: not more than 75 W.