sbcs technical webinars fax support in sbcs

© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1

SBCS Technical Webinars

Fax Support in SBCS

Marcos HernandezTechnical Marketing [email protected]

SBSBUJanuary 2009


Fax Transmission TechnologiesFax Passthrough

Fax Relay– Cisco Fax Relay

– T.38 Real Time Fax

Store and Forward (T.37)- Onramp & Offramp

SBCS Fax ApplicationsT.38 in a Multisite deployment

T.38 Capable ITSP’s

Fax to Email using CUE

Fax Detection (Single DID for Fax and Voice)

Printing Faxes

Fax Rollover

StoneVoice Integration

Additional Resources

Agenda


Fax Passthrough


Fax Passthrough

Modem/Fax Call Path via Modem Passthrough

IP Cloudpacket loss, jitter,delay

OGW

PSTN PSTNPSTN

Long Distance ($$$)

Fax

TGWPSTN PSTN

Traditional Modem/Fax Call Path

TDM Switch TDM Switch

Modulated Data

Fax

FaxFax


Transport of modem/fax signals through a packet network using PCM encoded packets.

A Fax tone triggers passthrough operation. After that, upspeed to g711, jitter buffers are locked and echo cancellation disabled

Fax tones are exchanged inband.

Fax Passthrough is a special case of Modem Passthrough. VBD (Voice Band Data) is Modem Passthrough.

FaxPassthrough Details


Fax Passthrough Global Setting Configuration

!!voice service voip voice service voip fax protocol pass-through g711ulaw fax protocol pass-through g711ulaw !!

This will cause all voip dial-peers to have fax protocol unless ‘nofax protocol’ is configured on the dial-peer


T.38 Fax Relay


Cisco FR and T.38 are conceptually identical. Cisco FR was implemented prior to the T.38 standard (similar to what happened with Cisco PoE), and that as a general rule, you would use T.38 since it is standardized.

Only reason for Cisco FR is compatibility with old hardware/software.

The rest of this presentation covers only T.38 concepts and services.

Cisco Fax Relay


T.38 Real-time Fax (Fax relay) solution Overview

Voice GW IP network

Voice GW

H.323/SIP/MGCPITU-T T.38Fax Relay

ITU-T T.30Group 3 fax


T.38 Fax Machine


T.38 Encapsulation

Voice GWVoice GW

IP Cloud

Group 3FAX

Group 3FAX

FXS FXS

T.38 Data Packet Encapsulation (UDP/TCP)

V.21 Carrying T.30. V.17/V.27/V.29 Carrying T.4.

T.30 Fax Commands,T.4 Fax Image Transfer


Real-Time Fax and T.38

ValueT.38 standard vs. Cisco proprietary fax relay

Cost reduction through use of IP network

Localized T.30 communication better than Fax Passthrough

Extend delay tolerance – T.30 spoofing, extra line padding, data redundancy

Improved delivery - “never busy service” (T.38 can fall back to T.37)


T.38 Global Setting Configuration

!!voice service voip voice service voip fax protocol t38 ls-redundancy 0 hs-redundancy 0fax protocol t38 ls-redundancy 0 hs-redundancy 0!!

This will cause all voip dial-peers to have fax protocol unless ‘nofax protocol t38 …’ is configured on the dial-peer


T.37 Store and Forward


S&F Onramp function

PSTN

• Authenticate sender against AAA

• Demodulate fax call and perform ITU-T T.30 fax protocol handling

• Encode fax image into TIFF file

• Create MIME email message with TIFF attachment

• Forward to ESMTP mail (fax) server.

• Create call history and AAA accounting records

IPMessaging server

F


S&F Offramp function

PSTN

•Authenticate sender against AAA

•Rasterize text portions of e-mail (text->fax)

•Decode TIFF-F image into fax pages

•ITU-T T.30 fax protocol handling

•Modulate fax call

•Create call history record

IPMessaging server


Store and forward fax

Value

Integration with standard email

Improved delivery - “never busy service”

Cost reduction though use of IP network

Store-and-forward offers features (broadcasting, customized cover pages, email conversion)

More reliable through storage

Green (saves paper)


SBCS Fax Applications


T.38 In Multisite Deployments

In a multisite Voice deployment, T.38 is recommended as all UC500 sites support it.

Significant bandwidth savings

Full Mesh Hub and Spoke

Site 2

Site 1

Site 3

Site 4 Site 5

Spoke 1

Hub

Spoke 2

Spoke 3 Spoke 4


T.38 Capable ITSP’s

Currently, T.38 support is minimal in the ITSP Community

From the CCA 1.9 list of supported providers, only XO and Nuvox support T.38

Please contact your ITSP to check for T.38 support.

VoIP

Fax Machine

ITSP Gateway

UC500

T.38

PSTN


Fax to Email using CUE Fax Caller from the outside calls the SMB fax number.

The fax line is connected to one of the POTS ports on the UC500 (T.37 not supported over VoIP trunks). That means that the UC500 will answer the call.

A script on the UC500 converts the fax message to an image file (.TIFF extension).

The UC500 forwards that message to a CUE voice mailbox designated for this purpose.

Notifications are enabled for the Fax mailbox.

CUE will then send an email to the address specified in the notification settings.

The email will contain the original fax message as a .TIFF attachment.

PSTN

Email Server

Fax Machine

UC500

POTS


Fax Detection Fax detection supports the use of a single E.164 number for both voice mail and fax mail by providing the capability to detect through an interactive voice response interface whether an incoming call is voice or fax.

Cisco provides a special script (named app_fax_detect.2.1.2.2.tcl) that will detect a fax tone if the call is a fax call and process it accordingly. If on the contrary, the call is a regular voice call, the UC500 will just route as such.

Some issues: It takes up to 9-10 seconds to detect a fax call. Single DID sounds great, but in should only be used where absolutely necessary – e.g. DIDs are too expensive.

Fax storage in CUE can be used.

Email Server

UC500

PSTN

POTS DID


Printing Faxes The UC500 can be configured to send faxes that are stored in CUE, to a

local fax machine for printing.

UC500 (CUE)


Fax Rollover The fax rollover IVR application provides a configured fallback to T.37 store-and-forward fax if a call attempts to use fax

relay and fails. An OGW must be configured with fax relay, store-and-forward fax, and also with the fax rollover application. Then, if a fax relay attempt fails, the call is forwarded to an SMTP server by a mail transfer agent (MTA) using T.37-standard protocols for store-and-forward fax.

VoIP

Fax MachineITSP GatewayUC500

T.38

PSTN

Email Server

T.37

1

2


T.38 Fax Server from StoneVoice StoneFax can automatically route incoming faxes in TIFF format to each user's mailbox and personal web interface, picking out the right recipient by the Called Line Identifier (DID support) or by the line on which the fax was received. This enables users to check faxes from anywhere in the world using either:A traditional desktop email client (i.e.: Outlook, Lotus Notes...). This is the Fax through email feature

A web browser (Internet Explorer, Netscape Navigator...). This is the Fax through web feature

To send a fax, each user can either:Create it as a new message in his/her email client, the Email To Fax featur

Upload a document via web through a dedicated web page, the Web To Fax feature

Directly print from any application to the StoneFax network printer, the Print To Fax feature

After the fax is sent, the user receives a transmission report in his/her inbox.

More information on:

http://www.stonevoice.com/Products/IPFaxServer/tabid/762/Default.aspx


Additional Information and Troubleshooting

Cisco Fax over IP Application Guide (Geek Alert!)http://www.cisco.com/en/US/partner/docs/ios/12_3/vvf_c/cisco_ios_fax_services_over_ip_application_guide/faxapp.html

Cisco IOS Fax Supporthttp://www.cisco.com/en/US/tech/tk652/tk777/tsd_technology_support_protocol_home.html

Fax to Email In UC500 App Notehttps://www.myciscocommunity.com/docs/DOC-1516

For questions:www.cisco.com/go/smallbizsupport


GlossaryITSP – Internet Telephony Service Provider

CUE – Cisco Unity Express (Voicemail Module in UC500)

IOS – Internetwork Operating System (Cisco Device OS)

CME – Communications Manager Express

CCA – Cisco Configuration Assistant

PCM – Pulse Code Modulation

DID – Direct Inward Dial

MIME – Multipurpose Internet Mail Extensions

AAA - Authentication, Authorization and Accounting

SMTP – Simple Mail Transport Protocol

H.323, SIP and MGCP – VoIP Signaling Protocols

ITU – International Telecommunication Union

V.XX and T.XX – ITU Recommendations for Fax Transmissions (see backup slides for details)

TIFF - Tagged Image File Format

OGW/TGW – Originating Gateway/Terminating Gateway


Backup Slides


Marketing Needs: cost savings End User: by past long distance PSTN

Carrier: Simplify call management: voice , modem, fax can all be treated the same way.

Technical Needs: TDM network is different from packet network

modem and fax are designed for TDM networks

designed to operate over synchronous TDM network

optimized to use the full PSTN channel bandwidth

overcome common line impairments seen in the PSTN

Not for packet network (packet loss, jitter, delay, compressed codec, asynchronous gateways)

Why is Fax Passthrough needed


T.38 Standards

T.4 – Defines encoding of printed data (modified Huffman encoding)

T.30 – Handshaking protocol for FAX call setup and transmission

T.38 – Fax Relay over IP Networks

V.17 – High Speed FAX (9600-14400 Bps)

V.21 – Low Speed FAX (300 Bps)




T.38 Fax Relay Function

PSTN

• Authenticate sender against AAA

• Demodulate fax call and perform ITU-T T.30 fax protocol handling

•Encapsulate T.30 messages into T.38 packets and send out over IP Leg

• Encode fax image into T.4 Format

• Create call history and AAA accounting records

IPF


T.38 Fax Relay Function

PSTN

•ITU-T T.30 fax protocol handling

•Receive T.30 messages within T.38 packets coming from IP Leg

•Decode T.4 image into fax pages

•Modulate fax call

•Create call history record

IP


T.37 S&F Fax solution overview

IP network

SMTP (RFCs 821 & 1651)MIME (RFCs 2405-2409)I-FAX (RFCs 2301-2305)



Message routing, storage and transport

T.37

ON-RAMP OFF-RAMP

CiscoOn-ramp Gateway

CiscoOff-ramp Gateway

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