commetrex corporation mike coffee ceo commetrex co-chair sip forum foip task group...
TRANSCRIPT
Commetrex Corporation
Mike CoffeeCEO Commetrex
Co-Chair SIP Forum FoIP Task Group
Phase II FoIP Testing
http://www.commetrex.com 3
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, intra-enterprise: 1998-2008+
• Phase II, SIP trunking: 2007+
• Phase III, tandem carriers: 2011+
And Now…Bring on The ITSPs & Carriers!
ILEC
ITSP
IPCarrier
IPCarrier
IPCarrier
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.
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
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
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 test200 out of 2000 calls
had late-arriving T.38 re-Invitesleading to fax failures.
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.
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)
(www.i3forum.org)
Workstream “Technical Aspects”
Testing ReportFax 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
Cbeyond
TeliaxLevel(3)
AT&TTDM
Network
CopiaFax
Server
CommetrexFax
Server
BoarderFunctions
BoarderFunctions
BoarderFunctions
168.75.50.854.55.8.66
192.168.21.3172.16.220.39
63.211.239.146
192.168.22.212
5 U GSX
5 U GSX
5 U 5850
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