© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 1 SBCS Technical Webinars Fax Support in SBCS Marcos Hernandez Technical Marketing Engineer SBSBU January 2009

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 2 Fax Transmission Technologies Fax Passthrough Fax Relay – Cisco Fax Relay – T.38 Real Time Fax Store and Forward (T.37) - Onramp & Offramp SBCS Fax Applications T.38 in a Multisite deployment T.38 Capable ITSPs Fax to 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 Cloud packet loss, jitter,delay OGW PSTN Long Distance ($$$) Fax TGW PSTN Traditional Modem/Fax Call Path TDM Switch Modulated Data Fax

© 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 fax protocol pass-through g711ulaw fax protocol pass-through g711ulaw! This will cause all voip dial-peers to have fax protocol unless no fax protocol is configured on the dial-peer

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 7 T.38 Fax Relay

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 8 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/MGCP ITU-T T.38 Fax Relay ITU-T T.30 Group 3 fax ITU-T T.30 Group 3 fax T.38 Fax Machine

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 10 T.38 Encapsulation Voice GW IP Cloud Group 3 FAX Group 3 FAX 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 Value T.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 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fax protocol t38 ls-redundancy 0 hs-redundancy 0! This will cause all voip dial-peers to have fax protocol unless no fax 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 message with TIFF attachment Forward to ESMTP mail (fax) server. Create call history and AAA accounting records IP Messaging 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 (text->fax) Decode TIFF-F image into fax pages ITU-T T.30 fax protocol handling Modulate fax call Create call history record IP Messaging server

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 16 Store and forward fax Value Integration with standard Improved delivery - never busy service Cost reduction though use of IP network Store-and-forward offers features (broadcasting, customized cover pages, 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 3Spoke 4

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 19 T.38 Capable ITSPs 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 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 to the address specified in the notification settings. The will contain the original fax message as a.TIFF attachment. PSTN 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 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. Server UC500 PSTN POTS DID

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 22 Printing Faxes The UC500 can be configured to send faxes that are stored in CUE, to a local fax machine for printing. UC500 (CUE)

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 23 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 Machine ITSP GatewayUC500 T.38 PSTN Server T

© 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 client (i.e.: Outlook, Lotus Notes...). This is the Fax through 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 client, the 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:

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 25 Additional Information and Troubleshooting Cisco Fax over IP Application Guide (Geek Alert!) ication_guide/faxapp.html Cisco IOS Fax Support Fax to In UC500 App Note For questions:

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 26 Glossary ITSP – Internet Telephony Service Provider CUE – Cisco Unity Express (Voic 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

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 28 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 ( Bps) V.21 – Low Speed FAX (300 Bps) V.27 – High Speed FAX ( Bps) V.29 – High Speed FAX ( 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 IP F

© 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 ) I-FAX (RFCs ) ITU-T T.30 Group 3 fax ITU-T T.30 Group 3 fax Message routing, storage and transport T.37 ON-RAMP OFF-RAMP Cisco On-ramp Gateway Cisco Off-ramp Gateway

© 2006 Cisco Systems, Inc. All rights reserved.Cisco ConfidentialPresentation_ID 33