Dialogic
®
I-Gate
®
4000 Media Gateways
IP Telephony Media Gateways
Datasheet
3
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. See Figure 1 for an example.
With the I-Gate 4000 Media Gateways, 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, and 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 softswitch-controlled VoIP
services, the I-Gate 4000 Media Gateways offer 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
Gateways 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.
Figure 1. Wireline or Mobile Interswitch Transport
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. See Figure 2 for an example.
Figure 2. Inter-MSC and Point-of-Interconnection
TDM or IP Network
PSTN or
MSC Switch
Dialogic
®
I-Gate
®
4000 PRO
Media Gatewayy
Dialogic
®
I-Gate
®
4000 EDGE
Media Gatewayy
PSTN or
MSC Switch
I-Gate 4000 EDGE
PSTN or
MSC Switch
compressed traffic
PSTN or
MSC Switch
I-Gate 4000 PRO
PSTN or
MSC Switch
I-Gate 4000 PRO
Mobile Phone
Remote Region
Local PSTN Switch
Remote Region
Local PSTN Switch
Dialogic
®
I-Gate
®
4000
PRO Media Gateway
Dialogic
®
I-Gate
®
4000
EDGE Media Gateway
I-Gate 4000 EDGE
I-Gate 4000 EDGE
MSC
MSC
MSC
Fixed Phone
POI
I-Gate 4000 PRO
g
Mobile Phone
Hub Site
I-Gate 4000 EDGE
Fixed Phone
POI
i d Ph
MSC
