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E1 to VoIP


Product: VoIP Media Gateway (Or called as Trunking Gateway too)

An interface between Voice over Internet Protocol (VoIP) and Public switched telephone network (PSTN).

It is a device whereby the VoIP line and PSTN line are connected so that an end user can use PSTN phones to make a call over VoIP.



Mass-market VoIP services started in 2004, and has been rapidly grew for recent years.

It is becoming increasingly common for telecommunications providers to use VoIP telephony over dedicated and public IP networks to connect switching centers and to interconnect with other telephony network providers.

Because of the bandwidth efficiency and low costs that VoIP technology can provide, businesses are migrating from traditional copper-wire telephone systems to VoIP systems to reduce their monthly phone costs.

And vice versa, many SIP providers who provide VoIP services, to match with customers’ requirements, should connect their VoIP networks to customers’ traditional PSTN network.


How to connect VoIP?

This can be implemented in several ways:

1.    VoIP Media Gateway from E1 to SIP, connects PSTN and VoIP by conversion between E1 and SIP.

2.    Analog Trunk Gateway from FXO to SIP, connects PSTN and VoIP by conversion between FXO trunk and SIP.

3.    Wireless Gateway from GSM / CDMA / WCDMA to SIP, connects PSTN and VoIP by conversion between GSM / CDMA / WCDMA and SIP.

This page will describe way No 1 only.


Illustrate the solutions of E1 to SIP

In PSTN or traditional TDM switch network, provides E1 interface only.

Vice versa, in VoIP network, provides SIP only.

Signaling protocol are different in both side, so connection for both side will be failed.

For example:

Under such a situation, Media Gateway / Trunking Gateway comes which make connection between them.

By using VoIP Media Gateway / Trunking Gateway, connection between PSTN / PBX System and VoIP network is established. After connection is established, for PSTN or for PBX System users, both of them will get benefit from VoIP technology; for SIP provider, they will easily sell their services and call route to traditional PSTN / PBX users.


Why choose Media Gateway / Trunking Gateway from NICEUC?

Easy connection is established between PSTN / Operators / TDM and VoIP network.

Carrier-grade, Reliable, high performance and Cost-effective products, were produced in 2005, and sold to all over the world (more than 50 countries and areas).

Flexible call rules and call routes, fully match with special requirement from customers.

Scalable modular design, it is convenient for users and customers to expand business easily in future. Capacity is from 1E1 to 52E1 ports per unit.

All kinds of signaling (ISDN PRI, SS7, R2/CAS, Q.SIG, V5.2, DPNSS) are supported by NICEUC Media Gateway / Trunking Gateway, one unit will solve varieties of connection.

Brief introduction for specification of the products used in this solution:





Slot of PSU




Qty of E1 / T1 card

1 to 2

1 to 4

1 to 13

Qty of E1 / T1 Port

1 to 8

1 to 16

1 to 52

VoIP Channel

32 to 256

32 to 512

32 to 1664

SIP Compatibility

CISCOSiemensAVAYAHuaweiZTE, etc

Input   Voltage

DC -48V   or AC 110-240V

DC -48V   or AC 110-240V (Redundancy)













For more information about above products, please turn and click to the menu "product"-" VoIP Media Gateway" on our website, or please contact us freely.