1. Technical Strategy: Secure SIP Trunking in Legacy PSTN/PBX Environments  
Rich Poole
Dialogic
Scott Beer
Ingate
September 2, 2009
The SIP Trunking Enabler

2. Agenda How Are Gateways Used Today? What Does A Gateway Do?
SIP Trunking Deployment – Issues & Options
Gateway Installation & Configuration

3. How Are Gateways Used Today?
Select Use Case Examples
Distributed IP Voice Messaging
Distributed IP Contact Center
Unified Communications:
Microsoft Office Communications Server 2007
IBM Lotus Sametime Unified Telephony
Motorola Total Enterprise Access & Mobility
Asterisk Business Edition
Fax over IP
SIP Trunking

4. How are Gateways Used in the Enterprise? IP Voice Messaging Use Case*
Digital Station Phones
Centralized Messaging / IVR
Brussels
Digital Station Emulation
Media Gateway
Nortel Meridian
LAN
T1 Media Gateway
Munich
WAN
Avaya
G3 PBX
E1 Media Gateway
Siemens
Hicom
Legacy Phones
Legacy
Phones
Analog
Media Gateway
PSTN
Stockholm
Ericsson
MD110
Legacy Phones
Headquarters
Remote Offices
* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

5. How are Gateways Used in the Enterprise
How are Gateways Used in the Enterprise? Distributed IP Contact Center Use Case*
The last application for media gateways I want to touch on today is the IP contact center.
IP transition in the contact center has really well defined benefits
Remote agent support
Off-load peak hours to other sites
Off-shoring via VoIP
Desktop IP soft phones, headsets and CTI data: agents = true knowledge workers
Multi-media / multi-modal communications – , chat, click to call, and soon video
Distributed architectures which scale well and can support multiple sites
The access to the PSTN for an IP contact center is through media gateways, and as the market continues to grow for IP contact centers in a range of densities, so too the market for supporting media gateways.
Dialogic works with a number of leading contact center technology and solution providers and our gateways our increasingly designed in to their solutions.
Media Gateway
* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

6. Basic Hybrid Media Gateway
How are Gateways Used in the Enterprise? Microsoft® Office Communications Server 2007 Use Case*
PSTN
legacy
PBX
Active directory
Microsoft® Office Communicator 2007
“Tanjay” phones
Basic Media Gateway
MS UC Mediation Server
Basic Hybrid Media Gateway
OCS Server(s)
* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

7. How are Gateways Used in the Enterprise
How are Gateways Used in the Enterprise? IBM® Lotus® Sametime® Unified Telephony Use Case*
T1/E1
T1/E1
* Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide.

8. How are Gateways Used in the Enterprise
How are Gateways Used in the Enterprise? Motorola TEAM (Total Enterprise Access & Mobility) Use Case*
“The TEAM VoWLAN solution turns the desktop into a pocketable virtual office.”
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

9. Allows Asterisk Developers to Augment Existing PBX Functionality
How are Gateways Used in the Enterprise? Media Gateway + Asterisk Business Edition Use Case*
Asterisk Business Edition
Media Gateways Enable Applications Built on Asterisk Business Edition
Media
Gateway
Allows Asterisk Developers to Augment Existing PBX Functionality
* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

10. FoIP software-based Fax Server
How are Gateways Used in the Enterprise? FoIP Server Solution Use Case*
Enables FoIP Server in TDM and Hybrid PBX Environment
Enables Fax Server to be Deployed as a Virtual Server
Enables Centralized Fax Servers for Multi-Site Organizations
T.30 Fax
T.38 FoIP
Media Gateway
PSTN
PBX
FoIP software-based Fax Server
Media Gateway
Remote Site
WAN
PBX
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide 10

11. How are Gateways Used in the Enterprise
How are Gateways Used in the Enterprise? SIP Trunking for Legacy PBX and Contact Centers
IP Telephony Service Provider
IP Network
PSTN
Service Provider
Gateway
SIP Trunking Service
Broadband Internet Access
Circuit Switched Voice Access
(Optional)
Border Element
Firewall
Circuit Switched Voice Access
Legacy PBX with
system
phones
Corporate Voice and Data LAN
VoIP
Gateway
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

12. What does a Gateway Do?

13. What does the Gateway do?
-Inputs/Outputs
What does the Gateway do?
IP Telephony Service Provider
IP Network
PSTN
TDM Interface
Transport: T1 or DS3
[Dig. Station Emulation, Analog]
Signaling: ISDN PRI, QSIG
[CAS, Serial (SMDI, MCI, MD-110)]
Voice: PCM
Service Provider
Gateway
SIP Trunking Service
Broadband Internet Access
Circuit Switched Voice Access
(Optional)
Border Element
Firewall
Circuit Switched Voice Access
Legacy PBX with
system
phones .
Corporate Voice and Data LAN
VoIP
Gateway
IP Interface:
Transport: IP
Signaling: SIP over UDP, TCP (or TLS)
Voice: G.7xx over RTP/RTCP (or sRTP)
QoS: DiffServ
Management Interface:
Config: HTTP (or HTTPs) Web GUI
[Telnet, Serial, RS-232]
Event Mgt.: SNMP, SMTP
SW Mgt.: BootP, TFTP
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

14. What does the Gateway do? -Internal Bearer
Bearer Processing:
Voice: - G.711, G.729AB, G.723.1, etc.
- G.168 Echo Cancellation
- VAD, SS, CNG
- [other codecs]
Tones: - DTMF Digit Relay (RFC2833 or SIP Info)
- Call Progress Detection (PVD, PAMD, DTMF, Fax Tone, Progress Tone, …)
Fax: - T.38 Fax over IP, G.711 Fax Bypass (T.30/G.711)
IP Telephony Service Provider
IP Network
PSTN
Service Provider
Gateway
SIP Trunking Service
Broadband Internet Access
Circuit Switched Voice Access
(Optional)
Border Element
Firewall
Circuit Switched Voice Access
Legacy PBX with
system
phones .
Corporate Voice and Data LAN
VoIP
Gateway
Transport Mediation:
Transport: TDM-to-SIP
TDM-to-TDM
SIP-to-SIP
Additional Controls:
- Gain Control for IP-TDM & TDM-IP
- Echo Cancellation Parameter
- Voice Activity Filters
- Call Progress Filters
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

15. What does the Gateway do? -Internal Processing
Supplementary Services:
Hold/UnHold
Call Transfer
Blind Transfer
Supervised Transfer
Message Waiting Indicator (MWI)
ANI / DNIS / Call Diversion Info
CPID
IP Telephony Service Provider
IP Network
PSTN
Service Provider
Gateway
SIP Trunking Service
Broadband Internet Access
Circuit Switched Voice Access
(Optional)
Border Element
Firewall
Circuit Switched Voice Access
Legacy PBX with
system
phones
Corporate Voice and Data LAN
VoIP
Gateway
Call Routing:
Digit Manipulation
Call Routing Engine
Alternate Routing for TDM & IP
Trunk Group Management
IP Route Management
Call Processing:
Call Setup/Teardown
Codec Negotiation
Fax Negotiation
DTMF Digit Relay
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

16. SIP Trunking Deployment Issues & Options

17. How are Gateways Deployed for SIP Trunking?
Issues:
Do I need to move all communciations to SIP?
How do I handle multiple offices & optimize deployments?
Bandwidth Requirements
How much is used already for data
Need to prioritize voice (more real-time)
Gateway & PBX Interop
Availability Considerations
Multiple Gateways
Alternate Routing
Failover upon power failure
How do you handle Fax?

18. Evolution of IP Fax (FoIP)
Store and forward
Scan image, attach to , and send
Not real time – no receipt confirmation
G.711 Pass Through
Encode fax audio for IP transport
Heavy bandwidth requirements
Susceptible to latency – high failure rate
T.38 FoIP
Created by the ITU to resolve the above issues

19. T.38 – Reliable IP Fax: Standard for real time IP Fax defined by ITU
Widely adopted by router manufacturers
Resolves latency issue that plagues G.711
Uses much less bandwidth
~ 35% of the bandwidth required by G.711
Preserves user experience
Positive receipt confirmation
Compliant to industry standards
Not T.37 store and forward as an attachment
Dialogic was a primary contributor to the T.38 spec

20. Legacy Configuration Use Case*
IP Network
PSTN
Circuit Switched Trunking
Broadband Internet Access
Firewall
Legacy PBX
Corporate LAN
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

21. SIP Trunking for Legacy PBX and Contact Centers
SIP Trunking for Legacy PBX and Contact Centers Phased SIP Trunking – Outbound Only Use Case*
IP Telephony Service Provider
PSTN
IP Network
Service Provider
Gateway
Inbound
Fax
Broadband Internet Access
SIP Trunking Service
Border Element
Outbound
Firewall
Legacy PBX
Circuit Switched Voice Access
Outbound traffic: Routed through SIP Trunking
Inbound traffic: Continues to be routed to PSTN
Fax: Routed through PSTN
Routing outbound calls to SIP Trunks could lower costs*
Route outbound traffic to Gateway (except from Fax extensions)
PSTN connection still available as alternate route for outbound traffic*
* Requires program change to PBX)
Corporate Voice and Data LAN
PSTN-VoIP
Gateway
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

22. SIP Trunking for Legacy PBX and Contact Centers
SIP Trunking for Legacy PBX and Contact Centers Phased SIP Trunking – PSTN Alt Route Use Case*
IP Telephony Service Provider
PSTN
IP Network
Fax
Alt Route
Service Provider
Gateway
Broadband Internet Access
SIP Trunking Service
Border Element
Inbound
Outbound
Firewall
Legacy PBX
Circuit Switched Voice Access
Corporate Voice and Data LAN
Outbound traffic: Routed to SIP Trunking
Inbound traffic: Routed to SIP Trunking
Fax: Routed through Gateway to/from PSTN
No or minimal change to PBX
Legacy PSTN available as Alternate Route for overflow traffic or as backup to SIP Trunks (IP or Power Failure)
PSTN-VoIP
Gateway
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

23. SIP Trunking for Legacy PBX and Contact Centers
SIP Trunking for Legacy PBX and Contact Centers Full SIP Trunking Solution Use Case*
IP Telephony Service Provider
PSTN
IP Network
Service Provider
Gateway
Broadband Internet Access
SIP Trunking Service
Inbound
Outbound
Fax
Border Element
Firewall
Circuit Switched Voice Access
Legacy PBX
Corporate Voice and Data LAN
Outbound traffic: Routed to SIP Trunking
Inbound traffic: Routed to SIP Trunking
Fax: Routed through Gateway
No or minimal change to PBX
Disconnection from legacy PSTN – lower costs
T.38 is preferred for fax, but G.711 Fax Relay may be acceptable
PSTN-VoIP
Gateway
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

24. SIP Trunking for Legacy PBX and Contact Centers
SIP Trunking for Legacy PBX and Contact Centers Remote Office SIP Trunking - Centralized Use Case*
Circuit Switched Voice Access
PSTN
IP Telephony Service Provider
Legacy
PBX
PSTN
IP Network
SIP Trunking Service
Broadband Internet Access
Corporate Voice & Data LAN
Corp Intranet
Remote Office
Border Element
Firewall
Legacy PBX
Circuit Switched Voice Access
Corporate Voice & Data LAN
VoIP
Gateway
Corporate traffic over Intranet – lower costs
Concentrate PSTN access through SIP Trunks
Optional Remote PSTN Access through gateway
Reduced remote legacy PSTN – lower costs
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

25. SIP Trunking for Legacy PBX and Contact Centers
SIP Trunking for Legacy PBX and Contact Centers Remote Office SIP Trunking – Distributed Use Case*
PSTN
IP Telephony Service Provider
SIP Trunking Service
IP Network
Corporate Voice & Data LAN
Corp Intranet
Remote Office
IP Network
SIP Trunking Service
Broadband Internet Access
Border Element
Legacy PBX
Circuit Switched Voice Access
Corporate Voice & Data LAN
VoIP
Gateway
Corporate data traffic over Intranet
Leverage ITSP Network with remote SIP Trunks
Remote PSTN available through gateway, if needed
- Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

26. Gateway Installation & Configuration

27. Installation Summary Connection to PBX Connection to LAN
Connect Gateway to PBX
Configure PBX to send calls to Gateway
Configure Gateway to connect to PBX
Connection to LAN
Connect Gateway to LAN
Configure SIP Trunking Provider to connect to Gateway
Configure Gateway to connect to SIP Trunking Provider
Test connections to PBX and SIP Trunking Provider

28. Gateway Configuration
Simplified Configuration Management & Troubleshooting
Initial Config
Use Serial Cable or Telnet to GW; Login; run ‘quickcfg’
Set IP Address / Subnet for Gateway & Default Network Gateway
Set T1/E1 & PBX Signaling Type (ISDN / CAS)
Restart Gateway
Web GUI
Login to Gateway
Disable BootP (else GW gets IP Addr from DHCP Server)
TDM Config
Set PCM Coding – µLaw (T1) , aLaw (E1)
Per span, set Line Encoding & Framing (e.g.: B8ZS & ESF)
Per ISDN span, set to “Network” or “Terminal” (Opposite of endpoint)
Enable “Failover” if Gateway is between PBX & PSTN
VoIP Config
Set IP Transport to UDP, TCP (or TLS)
Set Audio Compression – G.711-µLaw , G.711-aLaw, …
Set VAD on/off
Set RFC3960 Early Media on
Routing Config
Set up TDM Trunk Group(s) (e.g. PSTN, PBX, etc.)
Set up VoIP Host Group(s) (IP Endpoints)
Config Inbound TDM rules per Trunk Group – Specify Routing & Normalization
Config Inbound VoIP rules per VoIP Host Group & Number Normalization
Make Connections
Use built-in Trace Tools, Wireshark, ... to verify proper operation
Ready to use

29. Summary
89% Growth!
SIP Trunking demand is accelerating and moving upstream from SMB to the Enterprise
Ingate SIParator® and Ingate Firewall® products provide a secure, scalable and interoperable enterprise edge for SIP Trunking Services
Dialogic provides enterprise class media gateways to enable SIP trunking for legacy PBX and contact centers
Ingate and Dialogic provide interoperable products that enable a rapid return on investment from SIP Trunking deployments
SIP Trunk adoption moves an enterprise towards richer multi-media and unified communications services across public IP networks +

30. Questions? For more information visit:
… or contact us directly
Rich Poole:
Scott Beer:
Thanks for attending!

31. Dialogic, Dialogic Pro, Brooktrout, Diva, Cantata, SnowShore, Eicon, Eicon Networks, NMS Communications, NMS (stylized), Eiconcard, SIPcontrol, Diva ISDN, TruFax, Exnet, EXS, SwitchKit, N20, Making Innovation Thrive, Connecting to Growth, Video is the New Voice, Fusion, Vision, PacketMedia, NaturalAccess, NaturalCallControl, NaturalConference, NaturalFax and Shiva, among others as well as related logos, are either registered trademarks or trademarks of Dialogic Corporation or its subsidiaries (“Dialogic”). Ingate, Ingate Firewall, and Ingate SIParator are registered trademarks of Ingate Systems AB. Other names of actual companies and products mentioned herein are the trademarks of their respective owners. Dialogic encourages all users of its products to procure all necessary intellectual property licenses required to implement their concepts or applications, which licenses may vary from country to country. Dialogic may make changes to specifications, product descriptions, and plans at any time, without notice.
USE CASE(S) Any use case(s) shown and/or described herein represent one or more examples of the various ways, scenarios or environments in which Dialogic products can be used.  Such use case(s) are non-limiting and do not represent recommendations of Dialogic as to whether or how to use Dialogic products.
06/09