© 2006 cisco systems, inc. all rights reserved.cisco confidentialpresentation_id 1 sbcs technical...
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© 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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 2
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 3
Fax Passthrough
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 5
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 6
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 7
T.38 Fax Relay
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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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 9
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
ITU-T T.30Group 3 fax
T.38 Fax Machine
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 10
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 11
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)
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 12
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 13
T.37 Store and Forward
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 14
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 15
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 16
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)
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 17
SBCS Fax Applications
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 18
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 19
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 20
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 21
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
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Printing Faxes The UC500 can be configured to send faxes that are stored in CUE, to a
local fax machine for printing.
UC500 (CUE)
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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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 24
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 25
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 26
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 27
Backup Slides
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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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 29
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)
V.27 – High Speed FAX (2400-4800 Bps)
V.29 – High Speed FAX (4800-9600 Bps)
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 30
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 31
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
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 32
T.37 S&F Fax solution overview
IP network
SMTP (RFCs 821 & 1651)MIME (RFCs 2405-2409)I-FAX (RFCs 2301-2305)
ITU-T T.30Group 3 fax
ITU-T T.30Group 3 fax
Message routing, storage and transport
T.37
ON-RAMP OFF-RAMP
CiscoOn-ramp Gateway
CiscoOff-ramp Gateway
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 33