Solutions for upgrading the fixed and mobile line networks

SIP/E1 VoIP Media Gateway with Simultaneous support of signaling SIP, SS7, ISDN PRI, DSS1, QSIG, V5.2, CAS R2, R2 MFC, R1.5

E1 PCM Multiplexer

The device provides the possibility of distributing E1 flow channels between several E1 links.

E1 PCM Multiplexer in the telecommunications network

Pic 1. E1 PCM Multiplexer Connection Diagram

Signaling Converter

The signaling converter and protocols allows to combine systems that use different signaling protocols (SS7, PRI EDSS1, QSIG, V5.2, R2 CAS, R1.5, SIP) into a unified telecommunications network.

Signaling Converter Connection and Protocols Network connection diagram

Pic 2. Signaling Converter Connection and Protocols Diagram

TDM Digital Switch

TDM switch is a digital switch of E1 links that supports the following signaling types at a time: SS7, PRI EDSS1, V5.2, R2 CAS, R1.5, SIP.

The switch is designed to enhance efficiency of solutions when building and upgrading urban and corporate communications networks.

Digital TDM Switch and Signaling converter Network Connection Diagram

Pic 3. Digital TDM Switch Connection Diagram

SIP to E1 VoIP Media Gateway

SIP/E1 Gateway is a universal device used for VoIP and TDM telephony purposes.

This VoIP gateway provides integration of IP and TDM/PSTN networks, which allows to minimize expenses and reduce operating costs.

Since this gateway supports all signaling types used with PSTN network it can be used to redesign and upgrade all types of Telephone exchange used within the network.

Digital SIP to E1 VoIP Gateway Network Connection Diagram

Pic 4. SIP to E1 VoIP Gateway Connection Diagram

Network Maintenance and Monitoring System of Digital VoIP Gateways Parameters

Using a specialized network monitoring system from Terratel, it is possible to control all the key parameters of digital VoIP gateways (availability, bandwidth and emergency events).

The service provider must be informed promptly to take immediate remedial action. Gateway Monitor network software makes this possible.

Gateway Monitor software is a specialized network monitoring system for servicing up to 500 TERRATEL digital VoIP gateways (network elements).

Gateway Monitor uses SNMP protocol to work on the network.

Network system for monitoring parameters of digital VoIP gateways via SNMP protocol

Pic 5. Gateway Monitor network maintenance and monitoring system

Operating when the existing E1 stream is broken

Terratel SIP/E1 Gateway provides transparent connection of calls from PBX to PSTN and backwards. The communication costs can be minimized using SIP connection.

VoIP gateway when the existing E1 stream is broken Network Connection Diagram

Pic 6. VoIP gateway when the existing E1 stream is broken Connection Diagram

Connection Features:

  • Hardware crossconnection of E1 stream timeslots provides transparent connection, does not add the delay and does not reduce the audio quality.
  • Operating as signaling converter, for example PRI ISDN in SS7.
  • Optimizing the number of E1 channels/links towards PSTN.
  • Up to 460 SIP connections supporting G.711, G.723, G.726 and G.729 voice codecs and T.38 fax codec towards SIP providers.
  • Establishing SIP connections towards both sides of E1: towards PBX and towards PSTN.

Establishing Corporate VoIP Communication

This solution allows to eliminate the use of the central switching unit (Softswitch). This configuration creates the corresponding numbering plan in each gateway, i.e. each network element knows where the specific subscriber is and it can access his gateway directly.

Network Establishing Corporate VoIP and TDM Communication

Pic 7. Establishing Corporate VoIP Communication

Such an approach adds stability to the network since network outages do not occur when the central switching unit gets out of order.

The disadvantage of this approach increases as the number of gateways grows since it requires that each element of this network should be configured individually.

iDLU Gateway for upgrade EWSD digital switching system

The EWSD digital switching system upgrade concept is based on the decision to connect DLU digital line units directly to a specialized IP media gateway (iDLU Access Gateway) by using intra-exchange PCM lines and respective intra-exchange signaling.

Connection Diagram of upgrading DLU of EWSD system cabinets and enabling to NGN/IMS network

Pic 8. iDLU Gateway Connection Diagram.

This solution allows the telecommunications operator to reduce significantly the prime cost of telecommunications services provided to PSTN subscribers.

All subscribers of upgraded Telephone Exchange will obtain the full package of services from NGN/IMS service servers.

This will help to solve automatically the issues with call charging, switching to prospective numbering plans, porting numbers and monitoring outgoing and incoming calls.

Upgrading will make it possible to save the subscriber number when implementing the communications services using PON and FTTB technology (SIP telephony, Internet access, IP TV), which will encourage subscribers to switch to more expensive pricing plans.

iSUB Access Gateway for upgrade Telephone Exchange DX 200

The essence of switching DX200 R3, R4, R5 Telephone Exchange subscribers is in connecting SUB subscriber units directly to the dedicated IP media gateway (iSUB Access Gateway) by using intra-exchange PCM lines and respective intra-exchange signaling.

Network Enabled iSUB Access Gateway for Nokia DX 200 upgrade on NGN / IMS network

Pic 9. iSUB Access Gateway for Telephone Exchange DX 200 Connection Diagram

This solution allows the telecommunications operator to reduce significantly the prime cost of telecommunications services provided to PSTN subscribers.

All subscribers of upgraded Telephone Exchange will obtain the full package of services from NGN/IMS service servers.

This will help to solve automatically the issues with call charging, switching to prospective numbering plans, porting numbers and monitoring outgoing and incoming calls.

Upgrading will make it possible to save the subscriber number when implementing the communications services using PON and FTTB technology (SIP telephony, Internet access, IP TV), which will encourage subscribers to switch to more expensive pricing plans.

Read more about iSUB Access Gateway for Telephone Exchange DX 200 >>>

SS7 to SIP Gateway

We offer the SIP/E1 Gateway for upgrading telephone networks featuring multiple SS7 interfaces.

There are 2 options for using this gateway based on tasks to be solved.

Option 1 is used when it is required to replace the TDM Switch with the SoftSwitch. If multiple subscriber nodes are connected to the TDM Switch over the SS7 interface they can be switched to the SoftSwitch using the gateway as indicated on the following figure.

In this case the V5.2 interface disconnects from the TDM Switch and connects to the gateway that is connected to the SoftSwitch via the SIP data communications network.

Read more about SS7 to SIP Gateway >>>

SS7 to SIP Gateway to SoftSwich Network Connection Diagram

Pic 10. SS7 to SIP VoIP Gateway Connection Diagram

SIP to SS7 Gateway

Option 2 is used when it is required to connect VoIP subscribers from the local network to the PSTN number capacity. If the operator has the existing TDM Switch with free SS7 interfaces the gateway on the TDM network side looks as the SS7 subscriber node while on the IP network side it looks as the IP Telephone Exchange where IP subscribers register (please see the figure).

Read more about SIP to SS7 Gateway >>>

SIP to SS7 VoIP Gateway to Switching TDM Network Connection Diagram

Pic 11. SIP to SS7 VoIP Gateway Connection Diagram

V5.2 to SIP Gateway

We offer the gateway for upgrading telephone networks featuring multiple V5.2 interfaces.

There are 2 options for using this gateway based on tasks to be solved.

Option 1 is used when it is required to replace the TDM Switch with the SoftSwitch. If multiple subscriber nodes are connected to the TDM Switch over the V5.2 interface they can be switched to the SoftSwitch using the gateway as indicated on the following figure.

Read more about V5.2 to SIP Gateway >>>

V5.2 to SIP Gateway to SoftSwich Network Connection Diagram

Pic 12. V5.2 to SIP VoIP Gateway Connection Diagram.

In this case the V5.2 interface disconnects from the TDM Switch and connects to the gateway that is connected to the SoftSwitch via the SIP data communications network.

SIP to V5.2 Gateway

Option 2 is used when it is required to connect VoIP subscribers from the local network to the PSTN number capacity. If the operator has the existing TDM Switch with free V5.2 interfaces the gateway on the TDM network side looks as the V5.2 subscriber node while on the IP network side it looks as the IP Telephone Exchange where IP subscribers register (please see the figure).

Read more about SIP to V5.2 Gateway >>>

SIP to V5.2 Gateway to TDM Network Connection Diagram

Pic 13. SIP to V5.2 VoIP Gateway Connection Diagram

DSS1 to SIP Gateway

The DSS1 to SIP signaling connection diagram is similar to the SS7 to SIP signaling connection diagram.

SIP to DSS1 Gateway

The SIP to DSS1 signaling connection diagram is similar to the SIP to SS7 signaling connection diagram.