Commetrex Corporation Mike Coffee CEO, Commetrex SIP Forum FoIP Task Group FoIP In Carrier Networks UC-SIP Trunking Summit FoIP Session 11:00 AM 02/03/11

2 Fax Relay Packet Network Receiving Fax Transmitting Fax Real-Time Packet-Based Fax Emitting/on-ramp Gateway Receiving/off-ramp Gateway PSTN T.38 T.30

T.38 Deployment Phases: Phase I: Phase II:

Intra-Enterprise

And Now…The Carriers!

Voice Is Easy! Voice is generally the default Agree on a codec Enable the media stream Take care of jitter-buffer management Get rid of echo Youre done! Call set-up timing not critical.

Timing is everything. But in Fax…

FoIP…Added Complexity Computer-to-computer protocol (T.30) w/ timing requirements Synchronous modems (not just a different codec) with timing requirements For T.38, codec/media must be renegotiated and switched to SIP Timing is everything!

Is T.38 the Culprit?

10 T.38 Interoperability Lab

Carrier-Based Fax

The Challenge: Fax calls begin as voice. Negotiation takes time: G.711 pass-through fax? T.38? Can we switch to T.38 in time?

In a Recent Broadcast Test 200 out of 2000 calls had late-arriving T.38 re-Invites.

Session Border Controller

Just Kiddin SBC

The Slow-SIP Problem

Known Issues T.38 can be clearer about some parms V.34-SIP integration is complex Slow SIP leads to T.38 re-Invite failures

Phase II Challenges Whats being done about it?

SIP Forum Copyright © 2010 SIP Forum FoIP Task Group (Founded 9/08)

Copyright © 2010 SIP Forum Founded in 2000 in Sweden Leading non-profit IP communications industry association Individual, corporate, and academic members

SIP Forum & FoIP Task Group Leadership SIP Forum Leadership: Marc Robins, Managing Director and President, SIP Forum LLC Richard Shockey, Chairman of the Board Task Group Leadership: Mike Coffee, CEO, Commetrex, Co-Chair Gonzalo Salguiero, Cisco, Co-Chair Max Schroeder, VP, Faxcore, Task Group Whip Copyright © 2010 SIP Forum

FoIP Task Group Charter Investigate and resolve problems with the deployment of fax services, specifically ITU-T T.38, in SIP networks.

Task Group Goal Copyright © 2010 SIP Forum Develop and publish the guidelines (recommended practices) that will reduce the implementation problems that are today hindering IP-based fax deployments in carrier-based applications.

SIP Forum TG Docs SIP Forum – Official Fax Over IP Task Group Problem Statement Subgroup on T.38/V.34/V.8/V.152 call flows ITU-T T.38 SIP/SDP negotiation improvements Copyright © 2010 SIP Forum

V.34…Added Complexity Called GW, V34 fax supported Called GW, V34 fax not supported Calling GW, V34 fax supported Calling GW, V34 fax not supported T.38/V.34/V.8 Call Flows Doc

SIP Forum FoIP Task Group & The i3 Forum Copyright © 2010 SIP Forum Reliable IP-based real-time fax can only be achieved with effective cooperation between vendors (SIP Forum) and carriers (i3 Forum).

What the Industry Needs

Participants to date Deutsche Telekom iBasis SFT OTEGLOBE TATA Telkom SA WIS Telekom Italia Sparkle Telecom Poland Telefonica Reach FSB Telenor

Testing Objectives 1.G.711 or T.38? 2.Percentage successful image transfer 3.Time of the T.38 re-Invite 4.Relationship between the re-Invite delay and call success. 5.Image errors and their reasons. 6.Connect times and image-transfer times/speeds. 7.ECM? 8.FEC or Redundancy & depth 9.Call route and success rate correlation

Test Plan Ready International Routing T.38 Problems Connection Installation

Status

Schedule: Installation: Oct.-Feb. Testing: 1Q11 Collection/analysis: Q2 Recommendations: Q3 Follow-up testing: Q4 Final report:Q4/1Q12

SIP Forum FoIP Task Group… Conquering FoIP Phase II