technical strategy: secure sip trunking in legacy pstn/pbx environments

Technical Strategy:

Secure SIP Trunking in Legacy PSTN/PBX

Environments

Rich [email protected]

The SIP Trunking Enabler

Scott [email protected]

September 2, 2009

mailto:[email protected]


http://www.tmcnet.com/voip/conference/

© Copyright 2009 Dialogic Corporation. All rights reserved.

Slide 2

Agenda

How Are Gateways Used Today?

What Does A Gateway Do?

SIP Trunking Deployment – Issues & Options

Gateway Installation & Configuration


Slide 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


Slide 4

How are Gateways Used in the Enterprise?IP Voice Messaging Use Case*

Centralized Messaging / IVR

Digital Station Phones

Legacy Phones

Brussels

Munich

Stockholm

Headquarters

Legacy Phones

Avaya G3 PBX

WAN

Nortel Meridian

Remote Offices

Siemens Hicom

Legacy Phones

EricssonMD110

Digital Station EmulationMedia Gateway

E1 Media Gateway

Analog Media Gateway

T1 Media Gateway

* - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide

PSTN

LAN


Slide 5

How are Gateways Used in the Enterprise?Distributed IP Contact Center Use Case*

Media Gateway



Slide 6

How are Gateways Used in the Enterprise?Microsoft® Office Communications Server 2007 Use Case*

PSTN

legacyPBX

Active directory

Microsoft® Office Communicator 2007

“Tanjay” phones

Basic Media Gateway

MS UC Mediation Server

Basic Hybrid Media Gateway

OCS Server(s)



Slide 7

How are Gateways Used in the Enterprise?IBM® Lotus® Sametime® Unified Telephony Use Case*

* Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide.

T1/E1

T1/E1


Slide 8

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.”www.motorola.com

• - Please refer to ‘USE CASE(S)’ portion of the Legal Notice on the last slide


Slide 9

How are Gateways Used in the Enterprise?Media Gateway + Asterisk Business Edition Use Case*

Allows Asterisk Developers to Augment Existing PBX Functionality


Asterisk Business Edition

Media Gateways Enable Applications Built on Asterisk Business Edition

MediaGateway


Slide 10

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

PSTNFoIP software-based

Fax Server PBX

Media Gateway

T.38 FoIPT.30 Fax

PBXRemote Site WAN


Media Gateway


Slide 11

How are Gateways Used in the Enterprise? SIP Trunking for Legacy PBX and Contact Centers

PSTNIP Network

Firewall

Broadband Internet Access

IP Telephony Service Provider

Border Element Legacy

PBX with system phones

VoIP Gateway

Circuit Switched Voice Access

Corporate Voice and Data LAN

SIP Trunking Service

Service Provider Gateway Circuit Switched

Voice Access(Optional)



Slide 12

What does a Gateway Do?


Slide 13



(Optional)

What does the Gateway do?

PSTNIP Network

Firewall







Service Provider Gateway

VoIP Gateway

-Inputs/Outputs

TDM InterfaceTransport: T1 or DS3

[Dig. Station Emulation, Analog]Signaling: ISDN PRI, QSIG

[CAS, Serial (SMDI, MCI, MD-110)]Voice: PCM

Management Interface:Config: HTTP (or HTTPs) Web GUI

[Telnet, Serial, RS-232]Event Mgt.: SNMP, SMTPSW Mgt.: BootP, TFTP

IP Interface:Transport: IPSignaling: SIP over UDP, TCP (or TLS)Voice: G.7xx over RTP/RTCP (or sRTP)QoS: DiffServ



Slide 14



(Optional)

What does the Gateway do? -Internal Bearer

PSTNIP Network

Firewall








VoIP Gateway

Additional Controls:- Gain Control for IP-TDM & TDM-IP- Echo Cancellation Parameter- Voice Activity Filters- Call Progress Filters

Transport Mediation:Transport: TDM-to-SIP

TDM-to-TDMSIP-to-SIP

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)



Slide 15



(Optional)

What does the Gateway do? -Internal Processing

PSTNIP Network

Firewall








VoIP Gateway

Call Processing:- Call Setup/Teardown- Codec Negotiation- Fax Negotiation- DTMF Digit Relay

Call Routing:- Digit Manipulation- Call Routing Engine- Alternate Routing for TDM & IP- Trunk Group Management- IP Route Management

Supplementary Services:- Hold/UnHold- Call Transfer

- Blind Transfer- Supervised Transfer

- Message Waiting Indicator (MWI)- ANI / DNIS / Call Diversion Info- CPID



Slide 16

SIP Trunking Deployment Issues &

Options


Slide 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?


Slide 18

Evolution of IP Fax (FoIP)

T.37– Store and forward– Scan image, attach to email, 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


Slide 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 email attachment

Dialogic was a primary contributor to the T.38 spec


Slide 20

Legacy Configuration Use Case*

IP Network

Firewall


Circuit Switched Trunking

Corporate LAN

Legacy PBX

PSTN



Slide 21

SIP Trunking for Legacy PBX and Contact Centers Phased SIP Trunking – Outbound Only Use Case*

Firewall

PSTN-VoIP Gateway





Inbound

Outbound

Fax

Legacy PBX


Border Element

PSTNIP Network


Outbound traffic: Routed through SIP TrunkingInbound traffic: Continues to be routed to PSTNFax: 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)



Slide 22

SIP Trunking for Legacy PBX and Contact CentersPhased SIP Trunking – PSTN Alt Route Use Case*

Firewall

PSTN-VoIP Gateway





Inbound

Outbound

Fax

Alt R

oute

Legacy PBX


Border Element

PSTNIP Network


Outbound traffic: Routed to SIP TrunkingInbound traffic: Routed to SIP TrunkingFax: 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)



Slide 23

SIP Trunking for Legacy PBX and Contact CentersFull SIP Trunking Solution Use Case*

Firewall


Border Element

PSTN-VoIP Gateway





Inbound

Outbound

Fax Legacy PBX

PSTNIP Network


Outbound traffic: Routed to SIP TrunkingInbound traffic: Routed to SIP TrunkingFax: 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



Slide 24

SIP Trunking for Legacy PBX and Contact CentersRemote Office SIP Trunking - Centralized Use Case*

Firewall


Border Element

VoIP Gateway


Corporate Voice & Data LAN


Legacy PBX


PSTN


Corp Intranet

Remote Office

Legacy PBX

PSTNIP Network


• Corporate traffic over Intranet – lower costs• Concentrate PSTN access through SIP Trunks• Optional Remote PSTN Access through gateway• Reduced remote legacy PSTN – lower costs



Slide 25

PSTN

SIP Trunking for Legacy PBX and Contact CentersRemote Office SIP Trunking – Distributed Use Case*


Border Element

VoIP Gateway




Legacy PBX

IP NetworkSIP

Trunking Service

IP NetworkIP Telephony

Service Provider


Corp Intranet

Remote Office

• Corporate data traffic over Intranet• Leverage ITSP Network with remote SIP Trunks• Remote PSTN available through gateway, if needed



Slide 26

Gateway Installation & Configuration


Slide 27

Installation Summary

Connection to PBX• 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


Slide 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

Restart Gateway•Make Connections•Use built-in Trace Tools, Wireshark, ... to verify proper operation•Ready to use


Slide 29

Summary

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

89% Growth!

+


Slide 30

Questions?

For more information visit:– www.dialogic.com/solutions/uc/ingate.htm– www.dialogic.com/products/gateways/

– www.ingate.com

… or contact us directly• Rich Poole: [email protected]• Scott Beer: [email protected]

Thanks for attending!

http://www.dialogic.com/solutions/uc/ingate.htm

http://www.dialogic.com/products/gateways/

http://www.ingate.com/




Slide 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

www.dialogic.com

technical strategy: secure sip trunking in legacy pstn/pbx environments

Documents

media gateways

slide copyright

dialogic corporation

use cases portion

ip voice messaging use

ip contact centers

slide pstn lan copyright

ip transition