Commetrex Corporation Mike Coffee CEO Commetrex Co-Chair SIP Forum FoIP Task Group Phase II FoIP Testing

A Marriage of Necessity Carriers Vendors I3 Forum SIP Forum

3 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, intra-enterprise: Phase II, SIP trunking: Phase III, tandem carriers: 2011+

Intra-Enterprise

And Now…Bring on The ITSPs & Carriers!

Separating the Issues

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 You’re done! Call set-up timing not critical.

Timing is everything. But in Fax…

FoIP…It’s About Time Computer-to-computer protocol (T.30) Synchronous modems Media stream, which begins in G.711, wants to be renegotiated and switched to T.38 Timing is everything!

Phase III: Tandem-Carrier- Based Fax

So…What about testing? Many networks are untested for FoIP. Many carriers have SBC, proxies, and gateways incorrectly configured. Excessive signaling delay remains undiagnosed. Routes change frequently

Some Results: In a recent broadcast test 200 out of 2000 calls had late-arriving T.38 re-Invites leading to fax failures.

Outbound to ITSP Remote off hook T.38 re-Invite

G.711 Audio Caller Callee Point of no return T.38 re-Invite here. Bye-bye fax. DIS

So… Can our industry respond effectively to these problems?

SIP Forum FoIP 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.

The i3 Forum said “YES”

These Carriers said “Yes”! Deutsche Telekom iBasis SFT OTEGLOBE TATA Telkom SA WIS Telekom Italia Sparkle Telecom Poland Telefonica Reach FSB Telenor

Phase I Testing Report INTERNATIONAL INTERCONNECTION FORUM FOR SERVICES OVER IP (i3 FORUM) ( ) Workstream “Technical Aspects” Testing Report Fax over IP service (September 2011)

I3 Testing Results Using international-carrier SS7-based routing, call-completion rates were nominally 50%.

Phase II (Pairs) Testing Currently underway Testing partners identified Dig down for root cause of each problem

Copia-Commetrex Pairs Test

488? 491?

Meanwhile…

And the Next Day? 100% perfect faxes using both SIP trunking and G.711 over the open Internet.

Intelligent Routing User=fax ENUM

User=Fax user-param = "user=" ( "phone" / "ip" / other-user) RFC 3261, section 25.1, URI Parameters So, other-user = fax.

ENUM: Tells you where you want to go Convert E.164 numbers to DNS lookup Returns URI of user’s ENUM record Record contains info on all services HD voice is driver But what about fax? Used for IP-only routing

2012 Goal 2012 will be the year the global carriers finally begin the move to an all-IP network.