Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Commetrex Corporation The Three Phases of FoIP Deployment Mike Coffee CEO Commetrex Co-Chair SIP Forum FoIP Task Group [email protected] A Marriage of Necessity Carriers Vendors Fax Relay T.38 Emitting/on-ramp Gateway PSTN Transmitting Fax Receiving/off-ramp Gateway Packet Network Real-Time Packet-Based Fax PSTN Receiving Fax T.30 http://www.commetrex.com 3 T.38 Deployment Phases: • Phase I, intra-enterprise: 1998-2008+ • Phase II, SIP trunking: 2007+ • Phase III, tandem carriers: 2011+ Intra-Enterprise Fax Terminal T.38 Phase I ATA PSTN Enterprise LAN Enterprise Gateway FoIP Fax Server And Now…Bring on The ITSPs & Carriers! T.38 Phase II IP Carrier Fax Terminal ITSP IP Carrier ATA IP Carrier Enterprise LAN ILEC Router FoIP Fax Server Fax Terminal Separating the Issues SIP:17705555555 @12.34.456.78 FoIP Fax Server FoIP Fax Server SIP & T.38 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. But in Fax… Timing is everything. 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-CarrierBased Fax Fax Terminal ILEC PSTN IP Carrier IP Carrier ATA ITSP IP Carrier TDM Carrier Fax Terminal ILEC PSTN ILEC PSTN ITSP IP Carrier Fax Terminal Fax Terminal ATA So…What about testing? • Many networks are untested for FoIP. • Many firewalls and other network elements • are not correctly configured. Excessive signaling delay remains undiagnosed Plan Your FoIP Trip 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 DIS Callee Point of no return T.38 re-Invite here. Bye-bye fax. So… Can our industry respond effectively to these problems? SIP Forum FoIP Task Group Goal: 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. Copyright © 2010 SIP Forum 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 Testing Report INTERNATIONAL INTERCONNECTION FORUM FOR SERVICES OVER IP (i3 FORUM) www.i3forum.org) 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%. Next Steps Best Practices Recommendations In Q4 Intelligent Routing • User=fax • ENUM User=Fax RFC 3261, section 25.1, URI Parameters user-param = "user=" ( "phone" / "ip" / other-user) 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 SPEERMINT helps you get there • Session PEERing for Multimedia • • • INTerconnect Part of Real-Time Applications and Infrastructure study area (ENUM, SIP, Sigtran, etc) Indentify, signal, and route real-time communication sessions Picks up where ENUM leaves off SIP Forum & i3 Forum FoIP Task Groups… Will We Solve the Phase II & III problems?