integrated media gateway and the transition to ip

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Integrated Media Gateways

and the Transition to IP

Networks

Presented by Chika Kim, James Rafferty and David

Bridges

July 20, 2017


Presenters

Chika KimDigital Marketing Manager

David BridgesSales Engineer

North America Service Provider

Market

James RaffertyProduct Line Manager

Media Gateways


Poll


Agenda

Introductions

Overview: Transition to IP Networks

Why Circuit-Switched Networks Still Matter

Strategies for interconnecting TDM and IP Networks

Bridging the Gap: SIP Trunking via Media Gateways with SBC functions

How Media Transcoding Adds Value for Gateway Customers

Today’s Use Cases for Integrated Media Gateways

Case Study for Transition to SIP – SIP Networks with IPV6


Overview: Transition to IP Networks

Transition to IP networks is well underway

› Service providers and enterprises migrating customers to IP networks

› SIP trunking provides an IP connection between enterprises and carrier

› A recent study from IHS technology notes that 47% of North-American

respondents use SIP trunking today*

But T1/E1 trunks using TDM (Time Division Multiplexing) have not gone away

› Models for building service provider networks also evolving

Next Generation Networks (NGN) using a mix of TDM and IP technologies migrating to an

all-core, but still widely deployed

All IP core is built using the sip-centric IP Multimedia Subsystem (IMS) and Long Term

Evolution (LTE or 4G) radio technology

Fixed line networks also adapting an IMS model

* IHS Technology – SIP Trunking and eSBC Strategies – North American Enterprise Survey


Why Circuit-Switched Networks Still Matter

During the transition to IP, enterprises and carriers still need to connect to existing networks

Signaling system #7 (SS7) widely deployed for all 2G / 3G mobile networks and many fixed line networks

ISDN trunks still widely used by enterprises who haven’t switched to SIP trunks or communicate over

networks where SIP trunking not yet available

Hybrid technologies such as SIGTRAN provide ways of running stacks such as SS7 over IP transport

Many popular telecom services such as conferencing, unified messaging, contact centers and hosted IP

Centrex run as SIP applications, but need to support circuit-based customers

For all of these reasons, interconnect technologies such as media gateways, signaling gateways and

softswitches still play a valuable role in “connecting the dots” between IP and TDM

During 2016, just under 75 million media gateway channels were sold in the global market per IHS

technology*

* IHS Technology Service Provider VoIP and IMS Equipment and Subscribers Market Tracker – May 2017


Strategies for Interconnecting TDM and IP Networks

Media gateways are a key approach for interconnecting TDM and IP networks

› Key functions are:

Signaling translation to control the calls or sessions

Media translation (transcoding) for voice, fax, tones and sometimes video

Media gateways can be integrated or de-composed

› Integrated media gateways incorporate signaling translation within the gateway

› De-composed or NGN gateways rely on a separate softswitch for signaling

› Both integrated and de-composed media gateways provide media translation between TDM and IP

Most common signaling translations are:

› ISDN PRI (TDM) to SIP (IP)

› SS7 (TDM) to SIP

› Others signaling sometimes used includes CAS (TDM), H.323 (IP), SIGTRAN (IP)

Common media translations are:

› Voice – convert G.711 (TDM) or GSM mobile TDM) to IP codecs (G.729, G.723.1, iLBC, AMR-NB, AMR-WB)

› Fax – convert T.30 (TDM) to T.38 packets or G.711 over IP

› Voice – convert in-band tones to IP representations (most common are RFC 2833 and SIP INFO)


Strategies for Interconnecting TDM and IP Networks

Any to Any Signaling Example

An example of “any to any” signaling translation as provided by the Dialogic® IMG 2020 Integrated

Media Gateway is shown in the table below:

ISDN PRI SS7 ISUP SIP H.323 SIP-T/SIP-I ISUP/M3UA AS

TDMISDN ✓ ✓ ✓ ✓ ✓

SS7 ISUP ✓ ✓ ✓ ✓ ✓

IP

SIP ✓ ✓ ✓ ✓ ✓ ✓

H.323 ✓ ✓ ✓ ✓ ✓

SIP-T/SIP-I ✓ ✓ ✓

ISUP/M3UA AS ✓ ✓ ✓ ✓ ✓


Bridging the Gap: SIP Trunking via Media Gateways with

SBC functions

SIP trunks connect enterprises to service providers

› Gradually replacing ISDN PRI trunks, but media gateways can

support both

SIP forum has developed SIP connect agreements

› Designed to interconnect enterprise PBXs and service provider

networks

› Use specific subset of SIP operations for SIP trunking

› SIP connect 2.0 is latest version; compliance tests available for 1.1

Some media gateways can connect either IP or TDM PBXs to

SIP trunks

› SBC functions such as firewall, topology hiding, bulk registration can

be used by SBCs or media gateways in SIP trunking applications

Service providers

Enterprise

Dialogic® IMG 2020

VoIP PSTN

SIP trunk PRI

SIP TDM

IP / TDM / PBX


How Media Transcoding Adds Value for Gateway Customers

Traditional media gateway converts TDM media to IP packets

Digital Signal Processor (DSP) hardware in gateways can also transcode between different IP encodings

As needs for TDM – IP media conversions declines, can re-purpose gateways for transcoding

› Provides investment protection for customers

Some gateways can support simultaneous TDM – IP and transcoding operations

More flexible gateways also able to support all-IP signaling translation (SIP – SIP) and transcoding

Mobile operator

Dialogic® IMG 2020

Carrier-to-carrierMobile operator – VoLTE/4G

SIP / AMR-NB SIP / AMR-WB

MSC/MGW IMS core


Today’s Use Cases for Integrated

Media Gateways


Use case

› Carrier uses SS7 on gateway to interconnect to another carrier via SIP

Sample SS7 to SIP call flow

› SS7 messages converted to SIP session

Mobile operator

Dialogic® IMG 2020

Redundant pair

VoIP service provider

SS7 ISUP

MSC

SS7 ISUP

SIP

SIP

SS7 2020 IMG SIP

IAMINVITE

100 Trying

1st Response = 18x

2st Response = 183ACM

CPG message is conditional upon 18x

response on SIP side

200 OKANM

Use Case – SS7 to SIP Interworking | Carrier to Carrier


Use case

› Customer uses the gateway to connect ISDN or SS7 network customers

to a SIP-based contact center for inbound or outbound calls

Use Case – ISDN / SS7 to SIP – Contact Center

Service providers

Dialogic® IMG 2020

VoIP

PSTN

IP call server

PRI/SS7

SIP

IVR ACD

Workforce

management

Analytics Recording

Remote agent

Contact center

SIP trunk


Use case

› Customer provides unified messaging or other VAS solution

› Media gateway connects SS7-enabled users and interworks

with customer’s SIP-based application

Use Case – SS7 to SIP – Value Added Service

PLMN Application platform

MSC

3G

RTP

SIPSIP

SS7


Use case

› Mobile Virtual Network Operation (MVNO) provided for customers

› Media gateway connects SS7-enabled network for customers and

interworks with MVNO’s SIP-based control application

Use Case – SS7 to SIP for MVNO

PLMN Application platform

MSC

3G

RTP

SIPSIP

SS7


Use case

› Media gateway connects between customer’s IP networks and SIP-based VAS application

› Transcoding often a requirement

Use Case – SIP to SIP – Value Added Service

SIP/RTP IPV4

SIP

OTT IP network

3GPP mobile

IP network

SIP/RTP IPV6 SIP/RTP IPV4

SIP/RTP IPV4SIP

SIP messaging IPV4

Service delivery platform


Use case

› Carrier customer uses SIP and transcoding on media gateway to interconnect to another carrier

› Typically requires different SIP configurations on each side of the gateway

› May also use SIP extensions such as SIP-I

Use Case – SIP to SIP – Interconnect

Carrier A SS7 – IP Backbone

SIP

Carrier B IP BackboneSIP-I

SIP

SIP

Wireline

Wireless


eCall – Emergency Services for Vehicle Solution

Use case

› Service provider offers emergency services to vehicles

› Media gateway connects between SS7 Mobile Network

and SIP-based eCall infrastructure

› Other SIP-based components such as SBC and Media

Server part of the solution at the Public Safety

Answering Point (PSAP

›

eCall Public Safety Answering Point (PSAP)

EuropeanMNO

Emergency Services Agents

SIP

Voice & Data SIP

HTTPS

SIP

SS7

SIP

IP Contact Centre & PBX

HTTPS

IMG 2020 Gateway

BorderNet SBC

XMS

Media

Server

SIP

eCallApp Server


Case Study


Use case

› Tier 1 APAC carrier needed voice mail replacement system which could service

OTT, mobile IP and LTE customers on a combination of IPV4 and IPV6 networks.

Dialogic partnered with tier 1 UC applications provider and integrator

Customer needs

1. Gateway with SIP – SIP interworking, media transcoding and SBC features

2. Dual stack support for IPV4/IPV6 for media, signaling and DNS

3. Interwork between carrier SIP and SIP used by UC provider

4. Flexibility to extend solution for future networks such as volte

Key elements of solution

› Tier 1 UC provider offered voice mail replacement with extensions

› Dialogic® IMG 2020 gateway with enhancements for dual IPV4/IPV6 stack,

SBC functions and SIP interworking

› Initial solution supported both IPV4 and IPV6 subscribers

› Later extended to VoLTE network with IPV6 and high definition voice

(AMR wide band)

Case Study for Transition to SIP – SIP Networks with IPV6

SIP/RTP IPV6

OTT IP network

3GPP mobile

IP network

SIP/RTP IPV4

SIP

Service delivery platform SIP messaging IPV4

SIP/RTP IPV4SIP/RTP IPV4


New white papers from Dialogic available on the Dialogic web site:

Links to the Dialogic® IMG Integrated Media Gateways product pages

Technology brief: Efficient Any-to-Any Contact Center Connectivity: Dialogic® IMG 2020 Integrated

Media Gateway Improving Avaya Contact Center Deployments

SIP Connect 2.0 Specification from the SIP forum

Dialogic corporate blog

The Evolving Role

of Media Gateways

in Next-Generation

Networks

The Truth About

SIP Trunking: Why

SBCs Aren’t Your

Only Choice

Resources

A Smarter

Approach to SS7

and SIP Signaling

Interworking

http://www.dialogic.com/en/products/gateways/img.aspx?tile=product

http://www.dialogic.com/-/media/products/docs/techbrief/14111-avaya-img2020-tb.pdf

https://www.sipforum.org/download/sipconnect-technical-recommendation-version-2-0/?wpdmdl=2818

http://blog.dialogic.com/blog


Summary

Migration from circuit-switched to IP networks and applications underway

Integrated media gateways can greatly aid TDM to IP migration strategies for enterprises and

service providers

› Provide any to any signaling between widely deployed SS7 or ISDN networks and IP

› Convert voice, fax and tones for use over IP

› Support a wide variety of important use cases for both TDM – IP and IP - IP

SIP trunking is growing fast and connects enterprises and service providers via IP, but also

can be used with either IP or TDM PBXs and applications

› SIP trunking can be supported by gateways with SBC functions

Media gateways with transcoding can provide investment protection and support important

use cases such as SIP trunking and carrier interconnect

› Enables service providers to support voice over both traditional networks and advanced networks such

as LTE


IMG 2020 Attains Leading Revenue Market Share

Read the full press release here

http://www.dialogic.com/en/company/press-releases/2017/2017-07-13-dialogic-attains-leading-revenue-market-share-for-service-provider-trunk-media-gateways.aspx


Questions?


Dialogic is a registered trademark of Dialogic Corporation and all companies controlling,

controlled by, or under common control with Dialogic Corporation. (“Dialogic”).

The names of actual companies and products mentioned herein are the trademarks of their

respective owners.

09/17

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