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Completing the Convergence: Reliable Fax over your VoIP Network Bud Walder Enterprise Marketing Director

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Presentation on theme: "Completing the Convergence: Reliable Fax over your VoIP Network Bud Walder Enterprise Marketing Director"— Presentation transcript:

1 Completing the Convergence: Reliable Fax over your VoIP Network Bud Walder Enterprise Marketing Director Bud.walder@dialogic.com

2 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 2 Who is Dialogic Why is Fax Relevant in This Century Fax Market Drivers Faxing over IP Networks –T.30 Pass-Through vs. T.38 Fax-Relay FoIP over SIP Trunks: Deployment Scenarios Agenda

3 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 3 Dialogic Highlights Dialogic and Veraz Networks completed merger October 1, 2010 Listed on NASDAQ (DLGC) Annualized revenue greater than $250M 1 Leading portfolio of IP and TDM based multimedia processing and call control enabling technologies and products World class service and support (24/7) Deployed: –In High-Value Solutions that are in use by over 2 Billion Mobile Subscribers –In Network Infrastructure that carries over 5 Billion minutes of traffic per month –In 80% of Fortune 2000 companies 70+ issued US patents –Approximately 60 patent pending applications worldwide –Approximately 25 issued foreign patents 1 Following the merger and subsequent integration of the two companies and after excluding adjustments to revenue under purchase accounting rules The leading enabler for unleashing profit from video, voice and data for advanced networks

4 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 4 Rich Heritage of M&A

5 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 5 Bandwidth Optimization VoIP / FoIP Gateways Broad Multimedia Processing and Call Control Infrastructure Product Portfolio Call Control Infrastructure Multimedia Processing Infrastructure Session Border Controller Wireless Backhaul Bandwidth Optimization Softswitch Video Gateways Multimedia Processing Server Platforms Signaling Services Video Processing Server Software Dialogic® PowerMedia (HMP, IPMS and WMS) Server Software Dialogic® Media and Network Interface Boards (HMP interface series of boards, DM3 series, CG series, JCT series, Diva ®series, and Brooktrout® series) Dialogic®CSP and MSP platform Dialogic® BorderNet, IMG, and DMG series of service provider and enterprise gateways Dialogic I-Gate® 4000 and DTX-600 series Dialogic I-Gate® 4000 Session Bandwidth Optimizer Core Dialogic® PowerMedia Server Software Dialogic® Brooktrout® Fax Software Dialogic® ActionLine and Dialogic® Pro Services annuity support, installation and professional services Dialogic® Vision 1000 Video GW Dialogic I-Gate® 4000 Session Bandwidth Optimizer Backhaul Dialogic® DSI Signaling Servers Dialogic® TX and DSI Series of boards and software Dialogic® BorderNet 3000 SBC Dialogic® ControlSwitch Softswitch

6 Market Drivers: The Relevancy of Fax in the 21 st Century

7 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 7 Fax Servers –Document Management & Workflow –Production Fax & Productivity Enhancement –Compliance & Multi-Function Peripheral Integration Fax as table stakes for participation in Unified Communications Market Segment –OCS Migration to Fax over IP (FoIP) Why is Fax Still Relevant in This Century?

8 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 8 Corporate networks moving to VoIP Adoption of multi-functional peripherals (MFPs) Regulatory compliance Technology upgrades & interest in UM/UC Server virtualization Whats Driving Fax Sales Today?

9 Faxing over IP Networks Pass-Through vs. T.38 Fax-Relay

10 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 10 Traditional Faxing is based on the T.30 Protocol –T.30 was designed for a network with relatively smooth and uninterrupted data flows. –T.30 is an audio protocol. The sending and receiving fax machines are listening to the tones generated by the other machine. If tones are distorted, then the fax image will not be transmitted correctly. Traditional Faxing vs. Fax Over IP (FoIP)

11 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 11 As mentioned in the previous slide, T.30 was designed for a network with relatively smooth and uninterrupted data flows This is the opposite of the way an IP network was designed to operate. In other words the T.30 fax protocol was not created to tolerate the latency, jitter, and packet loss that are inherent in an IP network. The audio compression that takes place on a VoIP network may not affect a Voice call but can severely affect a Fax call. Why T.30 Fax Doesnt Work Reliably on a VoIP Network

12 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 12 Do Nothing –Attach your fax machines to your VoIP Network and live with the 80%-90% single page success rate that is achievable this way. –However, realize that the chance of a failed transmission is exponential as the number of pages increases. At 80% single page success rate 1 Page Fax - 0.8 1 – 80% Document Success Rate 2 Page Fax – 0.8 2 – 64% Document Success Rate 20 Page Fax – 0.8 20 – 0.922% Document Success Rate 55 Page Fax – 0.8 55 – 0.000% Document Success Rate How (NOT) to get a fax over an IP Network

13 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 13 A simple technique for creating a fax friendly" environment on a VoIP network. Makes very little distinction between voice calls and fax calls. Also called Voice Band Data (VBD) by the ITU, it refers to the transport of fax or modem signals over a voice channel through a packet network with an encoding appropriate for fax or modem signals. –G.711 (u-law or a-law) –Voice Activity Detection (VAD) off –Echo Cancelation (EC) off Faxing over an IP Network Option 1: Fax Pass-Through

14 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 14 Two Techniques –Dedicated Fax Trunks All ATAs, IADs, and gateways to be permanently locked at G.711 with VAD and EC disabled Easy to manage but the cost is the loss of the having a dedicated fax trunk More expensive Severely restricts the ability of telecom administrators to take advantage of any trunk sharing capabilities available with the PBX or IP-PBX in their infrastructure. –Dynamically Configured Fax Trunks Gateways that are able to distinguish between a voice call and a fax call in real time by detecting the V.21 preamble, which is part of all fax calls. Once this preamble is detected, the gateway automatically switches to Fax Pass-Through mode –David Haynes and Gonzalo Salguiero, Fax, Modem, and Text for IP Telephony (Cisco Press, 2008) Establishing a Fax Pass-Through Session

15 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 15 Breaks down the T.30 fax tones into their HDLC frames (known as demodulation) before sending the fax information through the network. This information is sent across the voice network using the T.38 Fax Relay protocol, and is then converted back into T.30 fax tones at the endpoint (known as modulation). The fax machines on either end are sending and receiving tones and are not aware that any demodulation or modulation is occurring. Uses a variety of techniques to keep the T.30 session communication between two T.30 endpoints from failing even when significant delay, jitter, and packet-loss occur. Faxing over an IP Network Option 2: T.38 Fax Relay

16 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 16 T.30 Fax Pass-Through –G.711 (u-law or a-law) –Voice Activity Detection (VAD) off –Echo Cancelation (EC) off –Move the audio (fax tones) through the network with as little distortion as possible T.38 Fax Relay –Demodulate the tones as close to the sending machine as possible. –Remodulate the tones as close to the receiving machine as possible Fax Pass-Through vs. T.38 Fax Relay

17 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 17 How do these two methods hold up in the face of Delay, Packet Loss and Jitter? Fax Pass-Through vs. T.38 Fax Relay (cont)

18 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 18 Effects of Delay, Packet Loss and Jitter on FoIP The packet-based networks performance requirements for real-time facsimile transmission - Tomaz Aljaz, Bohan Imperl, Urban Mrak, December 2006

19 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 19 The effects of fixed delay were nominal on both image quality and success rate. The test page was sent successfully (nearly 100% success rate) in both pass-through and relay mode with no image distortion. Increase in delay did result in measurably longer transmission times (as much as 15% longer transmission times with 500ms of network delay). Delay increased transmission time more significantly in Relay Mode than it did in Pass-Through Mode. Effects of Delay on FoIP

20 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 20 Jitter has no effect when sending faxes via T.38 Fax Relay It was not possible to recreate a network condition in the testing environment that the T.38 protocol, in redundant or non-redundant mode, could not have coped with. - Toma Aljaz, Boyan Imperl, and Urban Mrak, The packet-based networks performance requirements for real-time facsimile transmission, Computer Communications, Volume 30, Number 6, pp 1289-1300 (March 2007) Effects of Jitter on FoIP – T.38 Fax Relay

21 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 21 Jitter has significant negative impact on Fax Pass-Through –With a nominal delay of 60 ms and the maximum length of the jitter buffer set to 100 ms, the success rate for faxes sent using Fax Pass-Through fell to below 80% with delay variance of as little as 17 ms in some configurations. –Other configurations did stay at about an 80% success rate until the variance reached 25 ms. –The amount of Variance is more significant the degree of Variance. Success rate in Pass-Through mode increased when the maximum size of the jitter was set equal to the expected nominal delay. Increasing the maximum length of the jitter buffer to match the nominal delay had a negative effect on the quality of the voice conversations carried over the converged network. Effects of Jitter on FoIP – Fax Pass-Through

22 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 22 In all cases except T.38 in Redundant mode, just 1% packet loss caused 20% single-page failure rate In T.38R Mode, single-page Success Rate stayed above 80% until packet loss exceed 4% Caveat: Even in T.38R mode, bursty packet loss in which more than 10 packets in a row are lost, will significantly impact the success rate mode Effects of Packet Loss on FoIP

23 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 23 IP Network Issue T.30 Pass-Through Success rates T.38 Fax Relay Success Rates DelayMinimal Impact JitterSignificant ImpactMinimal Impact Packet LossSignificant ImpactMinor Impact Effects of Delay, Packet Loss and Jitter on FoIP - Summary

24 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 24 At 80% Single Page Success rate: –A fax document of more than 20 pages has less than a 1% chance of success. –A 55 Page Fax statistically cannot be delivered successfully. T.38 Fax Relay must be implemented throughout the network to meet the needs of the Market Place. In Addition, a T.38 call uses 20% of the amount of bandwidth needed for Fax Pass-Through. Fax Relay is a T.38 fax transmission that uses a stream of bits running at an average speed of 14,400 bps. Fax Pass-Through is a G.711 stream of audio samples running at 64,000 bps. Using Fax Relay can result in a bandwidth savings of 80% over Fax Pass-Through. Conclusion: T.38 = Reliable FoIP

25 FoIP over SIP Trunks: Deployment Issues

26 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 26 Deployment Scenarios –Fax Server + PBX / PSTN –FoIP Server + T.38 Gateway + PSTN Service –FoIP Server + T.38 IP-PBX + PSTN Service –FoIP Server + SBC / Gateway + T.38 enabled SIP Trunk Service –Fax Server (TDM) + T.38 Gateway + SIP Trunk Deploying Fax and FoIP

27 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 27 Fax Server Fax Machine image conversion engine T.30 protocol PSTN interface T.30 data Desktop Fax Application PSTN interface image conversion engine 64 kbps bandwidth T.30 Circuit-Switched Faxing T.30 PSTN

28 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 28 FoIP Gateway image conversion engine T.30 protocol T.38 end point protocol T.30 protocol PSTN interface IP network interface PSTN IP T.38 data much less bandwidth T.30 data T.38 fax relay protocol FoIPServer Traditional Fax Machine Desktop Fax Application PSTN image conversion engine Faxing with a FoIP gateway T.30 T.38 PBX

29 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 29 IP-PBX image conversion engine T.30 protocol T.38 end point protocol T.30 protocol PSTN interface IP network interface PSTN IP T.38 data much less bandwidth T.30 data T.38 fax relay protocol FoIPServer Traditional Fax Machine Desktop Fax Application PSTN image conversion engine FoIP with an Interoperable IP-PBX T.30 T.38

30 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 30 SIP Interop SIP QoS Demarcation SIP Security TDM / PSTN Gateway Firewall / NAT Traversal Fax / FoIP Gateway FoIP with an Interoperable SBC and SIP Trunk Service IP-PBX FoIP Server IP- Phone IP Soft- Phone ATA / FXS Gateway Fax Machine POTs Phone ITSP ISP PSTN Fax Machine SIP Trunk Service w/ T.38 Support Broadband Internet Service Dialogic® BorderNet 500 Gateway w/ Session Border Control * - Please refer to USE CASE(S) portion of the Legal Notice on the last slide PSTN Failover / Alternate Route

31 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 31 SIP Trunk Service w/ T.38 Support SIP Interop SIP QoS Demarcation SIP Security TDM / PSTN Gateway Firewall / NAT Traversal Fax / FoIP Gateway Faxing with an Interoperable SBC / Gateway and SIP Trunk Service ITSP ISP PSTN Fax Servers Legacy PBX (non-SIP) POTs Phone Fax Machine Digital Phone Broadband Internet Service BorderNet 500 Gateway w/ Session Border Control Optional PBX / PSTN Gateway Connectivity Support * - Please refer to USE CASE(S) portion of the Legal Notice on the last slide Corporate LAN / WAN Fax Machine

32 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 32 Dialogic ® Brooktrout ® TR1034 Fax Boards Dialogic ® Brooktrout ® SR140 Fax Software Dialogic ® Host Media Processing (HMP) Software Dialogic ® IP Media Server Dialogic ® Integrated Media Gateways Dialogic ® Media Gateway Series Dialogic ® BorderNet 500 Gateways Dialogic ® Products that Support T.38

33 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 33 Dialogic Enables our Partners to Create Innovative Applications in a Timely Manner, and is Investing to grow its position as the #1 Open Systems provider for the Converged Communication Market segment –Engineering –Sales and Marketing –Unrivaled Ecosystem of Partners Dialogic and our Products are there for you so you can Deliver your Solution to Market –Global Experience and Presence –World Class Service And Support (24x7) –Building Blocks At All Levels For Service Providers And Enterprise –Product Reliability and Delivery Why Choose Dialogic?

34 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 34 Fax is Still Relevant Today TDM solution are giving way to FoIP solutions –There are both benefits and pitfalls to be aware of when moving to an FoIP solution There are many options when implementing an FoIP Solution –Internal Hardware –Software Only Solutions –Gateways and Appliances –Virtualized Solutions –SIP Trunking –Hosted Solutions Wrap Up

35 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 35 Dialogic, Dialogic Pro, Brooktrout, Diva, Diva ISDN, Making Innovation Thrive, Video is the New Voice, Diastar, Cantata, TruFax, SwitchKit, SnowShore, Eicon, Eicon Networks, NMS Communications, NMS (stylized), Eiconcard, SIPcontrol, TrustedVideo, Exnet, EXS, Connecting to Growth, 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). The 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. This document discusses one or more open source products, systems and/or releases. Dialogic is not responsible for your decision to use open source in connection with Dialogic products (including without limitation those referred to herein), nor is Dialogic responsible for any present or future effects such usage might have, including without limitation effects on your products, your business, or your intellectual property rights. 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. 06/10

36 Completing the Convergence: Reliable Fax over your VoIP Network Jeff Dworkin jeff.dworkin@dialogic.com http://twitter.com/diastar http://facebook.com/jeffreygdworkin Q & A

37 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 37 VoIP = Voice over IP Why Put Voice on an IP Network? –Convergence reduces operating expense –Using VoIP reduces telephony costs Other VoIP Drivers –End-user productivity –PBX providers driving upgrades (e.g., Cisco, Avaya) VoIP Deployments Drive the Need for FoIP –As part of the migration to VoIP, enterprises need to move their fax infrastructure to IP Driver : Enterprise Adoption of VoIP

38 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 38 MFP = multi-function peripheral Enables consolidation & centralization of Fax infrastructure –Easier to manage a single shared resource –Elimination of Fax machines and associated costs Sales of MFPs will grow 24% by 2010 (IDC) MFPs Drive Growth of Fax Servers –MFP related fax server sales projected to grow 25% CAGR through 2011 (Davidson) Adoption of MFPs creates demand for IP-based Fax Driver : Continued Adoption of MFPs

39 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 39 Compliance regulations –E.g. Sarbanes-Oxley, HIPAA, USA Patriot Act –Forces businesses to track all messages and paper transactions, retrieve them, and to secure them confidentially –Personal liability of directors Drives increased use of MFPs and Fax Servers Driver : Compliance Regulations

40 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 40 Driver: Technology Upgrades Upgrades of Servers –OS upgrades can drive server changes –PCI, PCI-X to PCI-Express issues –Boards to board-less IP-based technology –Easy opportunity to introduce/sell FoIP Upgrades of PBXs –Depending on vendor, IP migration may require an all- IP solution including Fax –A natural opportunity to introduce/sell FoIP

41 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 41 Driver: Server Virtualization Virtual server technology (e.g. VMware, virtual server or Hyper-V) support multiple PC images running on one physical PC. Fax boards are not supported in virtual servers so all-software solutions are required – FoIP is the answer. This is also important for business continuity and disaster recovery plans.

42 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 42 Even though solution may exist as Software Only that does not guarantee that they can be virtualized. You still may need a Dedicated Server for each instance of the software Software Only Solution vs. Virtualization Fax Server #1 Fax Server #2 CRM Server #1 CRM Server #2

43 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 43 Software Only Solution vs. Virtualization Fax Server #1 Fax Server #2 CRM Server #1 CRM Server #2 Virtual Server #1 Virtual Server #2

44 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 44 Now you only have two servers –Each one is running both applications Fax Server CRM Server Real Virtualization Real Redundancy Software Only Solution vs. Virtualization Virtual Server #1 Virtual Server #2

45 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 45 Latency is the amount of time it takes for a sound uttered at one end of a conversation to arrive at the ear of the distant end of the conversation. Delay (or Fixed Delay) is that part of Latency that is a result of the physical configuration and/or design of the system –Processor Speed to Packetize –Distance the Packets have to travel –Processor Speed to DePacketize It is defined in a Perfect World Delay

46 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 46 Jitter is the Variable portion of Latency caused by the randomness of the World in general and the IP Network in particular –Load on the processor doing the packetization –Network Traffic –Routing Errors –Load on the processor doing the depacketization In a VoIP Implementation this variability is managed using a Jitter Buffer Jitter

47 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 47 Packet loss occurs when one or more packets of data traveling across a computer network fail to reach their destination.packetscomputer network Packet loss can be caused by a number of factors –Signal degradation over the network medium –Oversaturated network links –Corrupted packets rejected in-transit –Faulty networking hardware –Maligned system drivers or network applications –Normal routing routines Packet Loss

48 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 48 FoIP Server + Media Gateway: Example Use Cases * –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 PSTN Dialogic ® Brooktrout ® SR140 Fax Software-based Fax Server PBX Dialogic® 2000 Media Gateway Series T.38 FoIP T.30 Fax PBX Remote Site WAN * - Please refer to USE CASE(S) portion of the Legal Notice on the last slide

49 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 49 Appliance use in a VoIP/FoIP Implementation PSTN IP Network Firewall Broadband Internet Access IP Telephony Service Provider IP PBX / Contact Center PSTN- VoIP Gateway Corporate Voice and Data LAN Virtualized Fax Server

50 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 50 Fax documents are moved through the corporate WAN rather than into the PSTN or to the ITSP, reducing long distance telephony costs Using Centralized Servers (with Appliances at the edge) to reduce capital and operational expenses Appliances are easy to install and may be remotely configured, reducing associated time and expense while still being able to increase the capacity of the implementation as needed Appliances enhance reliability, redundancy and survivability Benefits Offered by using Appliances

51 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 51 SIP Trunking in a VoIP/FoIP Implementation PSTN IP Network Firewall Broadband Internet Access IP Telephony Service Provider IP PBX / Contact Center PSTN- VoIP Gateway Corporate Voice and Data LAN Virtualized Fax Server PSTN- VoIP Gateway

52 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 52 By maintaining only a single data network, rather than a voice network, SIP Trunking can reduce capital and operational expenses Without a connection to the PSTN, business operations can be streamlined with fewer vendors to deal with Interoperability and Gateway maintenance are handled by the carrier rather than the enterprise, reducing operational complexity and expenses Benefits Offered by using SIP Trunking

53 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 53 Hosted Services in a VoIP/FoIP Implementation PSTN Firewall Broadband Internet Access IP PBX / Contact Center Corporate Voice and Data LAN Virtualized Fax Server Virtualized Fax Server IP Network IP Telephony Service Provider PSTN- VoIP Gateway

54 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 54 Effectively manage Overflow or Unexpected Spikes in usage Minimize Capital Outlay and Potential Obsolescence Issues Remove geographic limitation of a CPE based solution Disaster Recovery Business Continuity Benefits Offered by using Hosted Fax Services

55 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 55 The Marketing for Individual Fax Machines in Shrinking But the Fax Server Marketing is actually Growing –The Fax over IP Fax Server segment is expected to show a Compounded Annual Growth Rate (CAGR) of 39.2% through 2011 and be worth $340 million. –Davidson Consulting, Computer-Based Fax Marketing, 2006-2011 (December 2007) Fax is NOT Going Away

56 © Copyright 2010 Dialogic Corporation. All rights reserved. SLIDE 56 [Aljaz] Toma Aljaz, Boyan Imperl, and Urban Mrak, The packet- based networks performance requirements for real-time facsimile transmission, Computer Communications, Volume 30, Number 6, pp 1289-1300 (March 2007) [Davidson] Davidson Consulting, Computer-Based Fax Marketing, 2006-2011 (December 2007) [Haynes] David Haynes and Gonzalo Salguiero, Fax, Modem, and Text for IP Telephony (Cisco Press, 2008) References


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