commetrex corporation mike coffee ceo, commetrex sip forum foip task group [email protected]...
TRANSCRIPT
Commetrex Corporation
Mike CoffeeCEO, Commetrex
SIP Forum FoIP Task [email protected]
“FoIP In Carrier Networks”UC-SIP Trunking Summit
FoIP Session11:00 AM 02/03/11
http://www.commetrex.com 2
Fax Relay
PacketNetwork
ReceivingFaxTransmitting
Fax
Real-TimePacket-Based
Fax
Emitting/on-ramp Gateway
Receiving/off-rampGateway
PSTNPSTN
T.38
T.30
T.38 Deployment Phases:
• Phase I: 1998-2008
• Phase II: 2007-2018
Intra-Enterprise
PSTNEnterprise LAN
EnterpriseGateway
FoIP FaxServer
Fax Terminal
ATA
T.38 Phase I
And Now…The Carriers!
ILEC
ITSP
XO
GlobalCrossing
Level(3)
Enterprise LAN
FoIP FaxServer
Fax Terminal
ATA
T.38 Phase II
Router
Fax Terminal
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…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?
InternetFax Terminal
Fax Terminal
ATA
ATA
http://www.commetrex.com 10
T.38 Interoperability Lab
Carrier-Based Fax
ITSP
ATA
ATA
Fax Terminal
Fax Terminal
ITSP
ILECPSTN
ILECPSTN
IP Carrier
IP Carrier
ILECPSTN
IP Carrier IP Carrier
TDM Carrier
Fax Terminal
Fax Terminal
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 callshad late-arriving T.38 re-Invites.
Session Border Controller
Just Kiddin’
SBC
The Slow-SIP Problem
CED
OK T.38
G.711Invite
CNGDCS
Caller’s RTP
Called RTP
DIS
RTP Flows here
Sessionresetshere
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
What’s being doneabout it?
SIP Forum
Copyright © 2010 SIP Forum
FoIP Task Group
(Founded 9/08)
Copyright © 2010 SIP Forum
www.sipforum.org
• 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
1 2
Carrier Start dateInst. & Config
Connect to switch
E.164 number delivered
Domestic PSTN to Local Sys.
Local Sys. to domestic PSTN
PSTN Poland to Local Sys.
Local Sys. to PSTN Poland
Poland to Local Sys.
Local Sys. to Poland
DT AG 10 /2010 10/15/2010 OK. OK. OK. Error_4 Error_3
iBasis 10 /2010 12/14/2010 OK. OK. OK.
SFR 06 /2010 12/2/2010 OK. Error_5
OTEGLOBE 06 /2010 11/4/2010 OK. OK. Error_6
TATA 06 /2010 10/18/2010 OK. OK. OK. OK. OK. OK.
Telkom SA 09 /2010 11/3/2010 OK. OK. SIP 406
TI Sparkle 09 /2010 10/8/2010 OK. OK. OK. OK. OK. OK.
TP S.A. 06 /2010 9/1/2010
Telefonica 09 /2010 11/5/2010
Reach 07 /2010 10/20/2010 OK. OK. OK. OK. OK. OK.
PCCW 06 /2010 12/29/2010 OK. Error_8
FT 10 /2010 10/26/2010 OK. OK. OK. OK. OK. OK.
WIS Telecom
3 5 6
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