Integrated Media Gateway and the Transition to IP

1© COPYRIGHT 2017 DIALOGIC CORPORATION. ALL RIGHTS RESERVED.
Integrated Media Gateways
and the Transition to IP
Networks
Presented by Chika Kim, James Rafferty and David
Bridges
July 20, 2017

Presenters
Chika Kim
Digital Marketing Manager
David Bridges
Sales Engineer
North America Service Provider
Market
James Rafferty
Product 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
TDM
ISDN ✓ ✓ ✓ ✓ ✓
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-carrier
Mobile 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
IAM
INVITE
100 Trying
1st Response = 18x
2st Response = 183
ACM
CPG message is conditional upon 18x
response on SIP side
200 OK
ANM
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 IPV4
SIP
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)
European
MNO
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
eCall
App 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 IPV4
SIP/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

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

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
Thank You

Integrated Media Gateway and the Transition to IP

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