I-Gate® 4000 Media Gateways are designed for telecom operators seeking a competitive advantage by moving to an operationally efficient and service-centric IP network. I-Gate 4000 Media Gateways deliver fixed-line toll-quality voice

in a compact footprint to satisfy Voice-over-IP (VoIP) and Voiceover-TDM telephony requirements in low- and medium-scale port densities.

I-Gate 4000 Media Gateways leverage sophisticated DSP technology, and have set a benchmark for voice quality in TDM and IP telephony, while preserving end-to-end service transparency for voice, fax, modem, and video calls. By combining high-quality bandwidth optimization, reliability, and scalability with open standards-based interfaces, the I-Gate 4000 Media Gateway Series can enable powerful operational and capital expense saving solutions for both incumbent and alternative service providers.

Field-Proven Voice Quality over TDM and IP Networks

The I-Gate 4000 Media Gateway Series is built by a team with over two decades in the telephony compression market, and have been deployed by hundreds of carriers in more than 100 countries for voice, fax, modem, video, and signaling traffic. The I-Gate 4000 Media Gateway Series enables carriers to bridge the gap between circuit-switched and next-generation Voice-over-IP (VoIP) networks by delivering packet voice quality that equals established PSTN standards.

Bandwidth Savings without Compromising Voice Quality

Field-proven voice processing technology and advanced codec implementations, coupled with a rich set of bandwidth optimization and voice quality protection techniques, enable carriers to realize bandwidth savings of up to 16:1 with I-Gate 4000 Media Gateways.

Bandwidth-Efficient and Reliable Signaling Transport

The unmatched ability of I gate 4000 Media Gateways to support bandwidth-efficient and reliable transport of Common Channel Signaling (CCS) for SS7, PRI, and QSIG and Channel Associated Signaling (CAS), despite network impairments, can deliver further bandwidth savings, full signaling robustness, and a high Call Completion Rate (CCR). In addition to bandwidth savings, this capability enables cost-effective network topologies based on the optimal location of signaling gateways at a small number of strategic sites.

Cost-Effective Fax, Modem, and Video Services

The highly efficient signal detection and processing techniques of I-Gate 4000 Media Gateways provide unrivaled highest voice, fax, modem, and video call completion rates with the exceptional quality, allowing the operator to curtail expenses while capturing

billable minutes.

Flexible Interoperation

I-Gate 4000 Gateways are built with total openness in mind — ready to interoperate with standards-compliant transmission and switching network elements. The gateways are consistent with next-generation network architecture models, offering proven interoperability with multivendor softswitches based on standard protocols such as MGCP, H.248, and SIGTRAN.

Static Trunking Applications

Despite continuing decreases in bandwidth costs, many international routes and national long-distance networks still have high transmission prices or limited available transmission bandwidth. For telecom operators carrying voice traffic over costly or bandwidth-limited transmission links, static trunking systems provide a distinctive solution for realizing substantial savings on bandwidth, equipment, and operations, more efficient utilization of deployed network resources, and new opportunities for improved competitiveness and increasing profitability

Applications that can benefit from static trunking include:

• Transmission of long-distance international and domestic telephony traffic

• Interconnection of MSC switches in mobile networks

• Backhaul transmission between MSC switches and Points of Interconnection (POI) to the PSTN

• Call center and business process outsourcing

• Backup protection networks

Wireline or Mobile Interswitch Transport Savings

In a static trunking solution, the traffic transmitted between PSTN and/or MSC switches is compressed by an I-Gate 4000 EDGE Gateway or I-Gate 4000 PRO Gateway connected to one of the switches and decompressed at a remote I-Gate 4000 EDGE Gateway or I-Gate 4000 PRO Gateway connected to the second switch. The compressed traffic can be carried over IP or TDM networks.

With the I-Gate 4000 Media Gateway Series, carriers can build one IP transport network and use it for both voice and data

enjoying the cost-efficiencies of converged IP transport prior to undertaking a full-fledged network migration. Carriers can use their existing IP infrastructure and bypass the TDM transmission core without compromising existing quality or stability, while preserving PSTN switch investment (for example, switches and OSS).

Since the same I-Gate 4000 EDGE Gateway or I-Gate 4000 PRO Gateway can be used for both static trunking and softswitchcontrolled VoIP services, the I-Gate 4000 Media Gateway Series offers a smooth evolution path from traditional TDM switches and

transmission links to all-IP next-generation networks. Carriers with a TDM switching infrastructure can initially leverage the static trunking capabilities of the I-Gate 4000 Media Gateway Series to lower costs by transporting voice over their packet-based data networks. Utilizing the same infrastructure, carriers can then migrate to a more flexible and cost-effective switched IP network by adding a softswitch platform to their networks.

Mobile Network Point of Interconnection

A significant number of calls between mobile phones and PSTN phones require transport through the PSTN long-distance

switching and transmission infrastructure. The mobile network operator often has to pay the wireline operator very high fees for long-distance service. By using a static trunking solution that compresses the traffic between the MSC site and a POI site near the local PSTN switch, the mobile operator can achieve significant savings by avoiding the need to pay long-distance fees.

Static Trunking in Satellite and Radio Link Applications

The high-compression techniques and voice quality protection mechanisms of I-Gate 4000 Media Gateways enable a costeffective solution for satellite and radio link routes over TDM or IP links. A static trunking solution with I-Gate 4000 Gateways can be deployed either in a single-route point-to-point configuration, or in a point-to-multipoint configuration (supporting multiple bearer links), thus handling traffic to multiple destinations. See Figure 3 for an example. Furthermore, the smart Endto-End Compression feature of the I-Gate 4000 Media Gateway Series can contribute to additional CAPEX and OPEX savings in applications encompassing call paths through several compression and decompression segments (hops).

As the I-Gate 4000 Media Gateway Series supports an in-band management feature, management traffic can be carried through the same bearer link that interconnects two distant sites, thus allowing the operator to manage remote I-Gate 4000 Media Gateways from a central (hub) site, with no need for separate management links.

In addition, the embedded cross-connect feature, which supports any-to-any cross-connection between E1/T1 64 kbps DS0 channels, allows operators to reduce overall expenses in applications requiring interconnection to multiple narrow bandwidth (thin-route) satellite links and in ring-topology microwave applications including drop/insert nodes.

Softswitch-Based Packet Toll/Tandem and Other Services

I-Gate 4000 Media Gateways can be controlled by a softswitch using MGCP, H.248/Megaco, or SIGTRAN. Through standards support, the I-Gate 4000 Media Gateway Series enables carriers to deploy next-generation VoIP switching solutions for applications such as domestic and international long-distance services, wireline or wireless network tandem switching, Class 4 switch replacement, and PRI trunking.

Softswitch-Based Packet Toll/Tandem and Other Services

I-Gate 4000 Media Gateways can be controlled by a softswitch using MGCP, H.248/Megaco, or SIGTRAN. Through standards support, the IGate 4000 Media Gateway Series enables carriers to deploy next-generation VoIP switching solutions for applications such as domestic and international long-distance services, wireline or wireless network tandem switching, Class 4 switch replacement, and PRI trunking.