Signaling Gateway

• A Signaling Gateway creates a bridge between the SS7 network and an IP network, under the control of the Gateway Controller.

• A Signaling Gateway causes a Softswitch to appear like an ordinary SS7 point code (SS7 node) in an SS7 network.

• The Signaling Gateway only handles SS7 signaling; a Media Gateway handles the voice circuits established by the SS7 signaling mechanism.

• SIGTRAN defines a suite of protocols and user adaptation layers for transporting signaling information over IP-based networks.

• If SigTran is used as the protocol between the Gateway Controller and the Signaling Gateway, then only MTP1, MTP2, and SigTran reside on the Signaling Gateway

1PTCL Training & Development

A Signaling Gateway usually supports the following layers: SCTP, which is responsible for reliable signaling

transport, streaming, congestion avoidance and control

M3UA, which supports the transport of ISUP, SCCP, and TUP messages over IP

M2UA, which supports congestion control and the transport of MTP3 messages

IUA, which supports the Q.931/Q.921 interface M2Peer, which supports the MTP3-to-MTP2

interface

2PTCL Training & Development

Signaling Gateway….

Functional Requirements Signaling Gateway

• A Signaling Gateway must support the following functions:• It must provide physical connectivity to the SS7 network

via a TI/El or Tl/V.35 physical connection• It must be able to transport SS7 information between

Gateway Controller and Signaling Gateway via an IP network

• It must provide a transmission path for voice, video, and optionally data. (Data transmission may be supported within the Media Gateway.)

• Provide Highly Available SS7 operation for telecommunication services

3PTCL Training & Development

System Characteristics Signaling Gateway

A Signaling Gateway has the following system characteristics: It is I/O intensive, but not very CPU intensive. A maximum amount of memory should be

available to hold state information, configuration information, the point code map, alternate routes, etc.

A disk storage is primarily used for logging; a small capacity may be adequate.

The Ethernet interface (to the IP network) may require dual redundancy.

4PTCL Training & Development

Signaling Gateway Characteristics

It may interface with the SS7 network by using a T1/E1/E1, with a minimum 2 D-channels, and a maximum 16 D-channels.

Performance and flexibility can be increased using a H.110 or H.100 bus.

High Availability is a requirement, multiple Signaling Gateways or signaling links are available. Redundancy is built into SS7 networks by design

5PTCL Training & Development

Convergence of SS7 and IP networks

6PTCL Training & Development

Call Control Functionality

7PTCL Training & Development

PTCL Training & Development 8

SEGway X401 Signaling Gateway

• Ability to scale upto 1408 SS7 links with HSL, 1000SIGTRAN M2PA/M3UA/SUA associations.

• 14 slots available for I/O and application server blades thus unprecedented flexibility to interface with traditional SS7 and IP-SIGTRAN networks

PTCL Training & Development 9

SEGway X301 Signaling Gateway

• Ability to scale upto 128 SS7 links

• Six payload slots available for low TDM and high speed (IP-SIGTRAN) this solution can be used to manage SS7 networks and connect with multiple interconnectivity partners.