Peering & Routing Designs Using Session Controllers &

munchdrabNetworking and Communications

Oct 30, 2013 (3 years and 9 months ago)

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Peering & Routing Designs Using
Session Controllers &

Media Gateways

James Rafferty

Voice Peering Forum

March 8, 2007

Cantata Technology, Inc. confidential. Not for distribution without permission.

2

October 30, 2013

Agenda


Cantata Overview


Topic Overview


Roles and Relationships


TDM to IP network


All IP networks


Applications and Case Studies


Summary

Cantata Technology, Inc. confidential. Not for distribution without permission.

3

October 30, 2013

About Cantata Technology


Leading provider of enabling
technology for the enterprise
and service provider markets.



Formed by the combination of
Excel Switching and
Brooktrout Technology



Founded in 1984



300+ employees worldwide


Global company


Headquarters in Needham,
Massachusetts


Principal offices in MA, NH,
CA, Belgium, and Japan



Distribution:


Enterprise: distributor and
reseller network, direct OEM


Service Providers: regional
distributors, direct OEM sales



Unique partner philosophy

Cantata Technology, Inc. confidential. Not for distribution without permission.

4

October 30, 2013

Overview


Evolving Voice Network


Voice network evolution Trends


PSTN


Hybrid


IP


IP network islands


Federations of IP


Creates need to connect all of the various
network possibilities


Traditional


connect via Tier 1 carrier


Peering Model


connect directly between co
-
located carriers

Cantata Technology, Inc. confidential. Not for distribution without permission.

5

October 30, 2013

Complicating Factors


Signaling


Multiple Signaling protocols


IP


SIP, H.323, H.248


TDM


SS7 ISUP, ISDN PRI, CAS


Media


Various voice codecs


Need support for fax, data and tones


Business


Carriers need to agree to work together, then they
can solve the technical matters

Cantata Technology, Inc. confidential. Not for distribution without permission.

6

October 30, 2013

Stepping Into the Breach


Solving the signaling problem


Integrated media / signaling gateways can interwork between the
PSTN and IP networks


SBCs sometimes used for mediation of signaling between IP
networks


Solving the media problem


Media gateways can transcode between different media formats
(voice, fax, tones)


Solving the Routing problem


Calls can be routed either by SBC or MGW routing engine


May want to use ENUM for PSTN
-
> SIP address translation


Connecting the Islands


VoIP Carriers can connect either directly or via a peering fabric


Direct IP connection is possible, but SBCs typically patrol the
borders

Cantata Technology, Inc. confidential. Not for distribution without permission.

7

October 30, 2013

Cantata’s Integrated Media Gateway

IMG 1010



Provides Essential Media Support


Broad range of VoIP/wireless codecs and T.38 IP fax


Any to Any signaling


SS7 ISUP, ISDN, CAS*, SIP and H.323


Address Translation


Use ENUM for E.164 phone number
-
> SIP *


Available in both TDM
-
IP gateway and IP
-
IP models


Compact 1U footprint, scalable from 96 to 768 ports


DS3, T1 and E1 interfaces all available


Backed by a world class Cantata support team



* Available Q1, 2007

Cantata Technology, Inc. confidential. Not for distribution without permission.

8

October 30, 2013

Making the Connection: TDM
-
> IP

IMG

1010

Media Gateway

TDM Carrier

SS

7

+

TDM

ISDN / CAS

SIP

/

H

.

323

IP Carrier

Media Gateway Functions:

PSTN
-
to
-
IP Connection


>Media


>Signaling


>Routing

Call 1


TDM
-

TDM

Call 2


TDM
-

IP

Cantata Technology, Inc. confidential. Not for distribution without permission.

9

October 30, 2013

Making the Connection: TDM/IP to IP

IMG

1010

Media Gateway

TDM Carrier

SS

7

+

TDM

ISDN / CAS

IP Carrier

1

Media Gateway Functions:

PSTN
-
to
-
IP Connection


>Media


>Signaling


>Routing

Call 1


TDM
-

TDM

Call 2


TDM


IP


Carrier 1

IP Carrier

2

Session Border

Controller

SIP / H.323

SIP / H.323

Call 3


IP


IP


Carrier 1
-
> 2

SIP

SBC Functions:

IP
-
to
-
IP connection


>Firewall and NAT


traversal


>Policy enforcement


>Security


>Signaling Interwork


(SIP, H.323)


Cantata Technology, Inc. confidential. Not for distribution without permission.

10

October 30, 2013

TDM/IP to IP with Peering



IMG 1010

Media Gateway

TDM Carrier

SS

7

+

TDM

ISDN / CAS

IP Carrier

1

Media Gateway
Functions:

PSTN
-
to
-
IP Connection


>Media


>Signaling


>Routing

IP to IP Connection

>Transcoding

> ENUM address
translation

IP Carrier

2

Session Border

Controller

SIP / H.323

SIP

SBC Functions:

IP
-
to
-
IP connection


>Firewall and NAT


traversal


>Policy enforcement


>Security


>Signaling Interwork


(SIP, H.323)


Peering Fabric
offers simpler
connections among
carriers

SIP / H.323

RTP

SIP

SIP

Call 1


IP


IP

(transcode iLBC
-
> G.729)

Cantata Technology, Inc. confidential. Not for distribution without permission.

11

October 30, 2013

Summary


Transition from TDM to IP networks underway


Carriers need to connect between diverse
networks


Cantata’s IMG 1010 provides TDM


IP
signaling, address and media translation


Also transcoding for all
-
IP networks


Cantata partners with SBC vendors to meet
overall carrier needs


IMG can be coupled with SBCs and Peering
Fabrics to support a wide variety of
connections and call flows