Internet2 Fall 2003GT-VoIP/RNP1 VoIP deployment in RNP: experience and future developments Paulo Aguiar GT-VoIP/RNP

Internet2 Fall 2003 GT-VoIP/RNP 1

VoIP deployment in RNP: experience and future

developments

Paulo AguiarGT-VoIP/RNP


Outline RNP VOIP Working Group VOIP Pilot architecture Numbering plan and IVR Preliminary experiments QoS strategy Monitoring tools Forthcoming scalability issues


RNP Working Groups Established to foment technological

studies aiming to bringing new services to RNP backbone

Approved groups (GTs) in 2002 VoIP, Video, Directories, Monitoring and

QoS New Advanced VOIP WG has been

approved thru Oct/04


GT-VoIP Main Goals

Deploy a telephony over IP pilot interconnecting a restricted group of PBXs

Establish conditions for launching a scalable VOIP service in 2004

Contribute to the dissemination of VoIP technology

• Workshops and training seminars• Grow a participant community around the pilot


Needs for VoIP Flexibility

Unavailability of direct call to extension or some PBX may not receive/originate out calls

Telephone may not be ubiquitous Network may exist but no telephone

Costs Long distant tariffs are prohibitive

• Impacts national and international cooperation• Impacts interaction during traveling

Get ready for the future


Challenges Inexistant VoIP knowledge among

technicians UFRJ VoIP lab was used as the main

technical supporting group Highly congested links in the

backbone during working hours QoS mandatory to achieve acceptable

RTT, loss and jitter


Pilot: H.323 architecture

TypicalInstitution

Gatekeeper

GatewayDirectory

Gatekeeper

PBX

Cisco ATA Radius

Managementstation

Secondary Radius

RNP2

VOIP WG Internet 2

Virtual phones are allocated a virtual E.164 number and IP/alias authenticated in GK


Gatekeeper Gateways and virtual phones register

served prefixes and aliases with GK Performs basic registration,

authentication and authorization Extended procedures to support mobility have

to be pursued with LDAP integration or so Configured as media and signaling proxy

QoS in backbone only needs to prioritize and trust traffic from GKs and gateways


Function Recommended Product Source

Gatekeeper GnuGK http://www.gnugk.org

VoIP Gateway See P5.1 Report chapter 2

http://www.voip.nce.ufrj.br/publication/reports/gt-voip-

7.pdf

Radius Server FreeRadius http://www.freeradius.org

Datebase MySQL http://www.mysql.org

H.323 Client Microsoft Netmeeting http://www.microsoft.com

H.323 Client OpenPhone V1.7.0 http://www.openh323.org/bin/

Software OpenH323 project, Free Radius and MySQL Gateway requirements

Gt-VOIP P5.1 Report


Directory GK

Institution A

H.323 Client

H.323 Client

Gateway

Gateway GK

Institution B

Gateway

Gateway

H.323 Client

H.323 Client

GK

DGKBrasil


Numbering Plan

Internet2

DGK

DGKBrasil

5500…

GKUFRJ

GKMEC

55212598……550212598……

5561410…55061410.……

**


DGK Internet2I2 GATEKEEPER CONFIGURATION

(gk01.internet2.edu)Updated 06 December 2002

gatekeeper zone local IUGK iu.edu 134.68.106.10 ! Indiana University zone local PSUGK psu.edu ! Penn State University zone local UVIRGINIAGK virginia.edu ! University of Virginia zone local NWUGK nwu.edu ! Northwestern University zone local UWISCGK wisc.edu ! University of Wisconsin, Madison zone local UWASHINGTONGK washington.edu ! University of Washington zone local IHETSGK ihets.org ! Indiana Higher Education Telecommunication System zone remote AARNet edu.au 203.22.212.245 1719 ! Australian Academic and Research Network zone remote UIUCGK uiuc.edu 130.126.1.3 1719 ! University of Illinois at Urbana-Champaign zone remote UFRJGK ufrj.br 146.164.247.202 1719 ! Universidade Federal do Rio de Janeiro –

Universidade do Brasil zone remote UFLGK ufl.edu 128.227.75.68 1719 ! University of Florida zone remote CESNETGK cesnet.cz 195.113.144.84 1719 ! Czech National Research & Education

Network zone remote UCGK uc.edu 129.137.0.2 1719 ! University of Cincinnati zone remote TAMUI2 tamu.edu 165.91.160.4 1719 ! Texas A&M University zone remote UNAMGK unam.mx 132.247.253.242 1719 ! Universidad Nacional Autónoma de México zone remote SURFNET surfnet.nl 192.87.116.96 1719 ! SURFNET (Netherlands) zone remote CSUGK colostate.edu 129.82.103.67 1719 ! Colorado State University zone remote ITESMGK qro.itesm.mx 132.254.80.51 1719! Tecnologico De Monterrey


Numbering Plan

UFRJ network

GKUFRJ

212598....*

*

0212598400104001

peixoto

0212598.... (virtual phones)

PBXPBX 0212598400204002cesar

* .... (extension)


Pilot Status 14 participating institutions GKs, Radius e virtual phones have

been installed, waiting arrival of gateways


IVR Interactive Voice Response

Colects DTMF in response to pre-recorded message

Runs in gateway or externally We have developed external IVR which

may interact with gateway via H.225 facilities or H.450 supplementary services


IVR Role To access VoIP service, user calls a

key number in PBX which directs call to gateway and associated IVR

IVR allows explicit use of VoIP Essential to avoid PBX reprogramming Experimental service deployed without

any change in regular PBX operation


Finding Registered Virtual Phones


Finding Registered Virtual Phones


Gateway at UFRJ allowed calls to/from the city of Rio de Janeiro

PSTN

Demo during WRNP and SBRC (mai/03)

PBX

UFRJ

Gateway IVRCisco 4224

RNP2

Rio

Natal

Cisco 2611

PBX

Hotel

IVRGateway

GK Gk and gateway installed

in hotel in Natal 4 analog PBX extensions

connected to gateway


Demo Complexity


BackboneLink Utilization


Collected Statistics: Calls per hour

A total of 440 calls Average duration = 3 minutes

SUN MON TUE WED THU FRI


Collected Statistics: Average Packet Loss

Packet Loss (%) – hour average


Rio Natal

Natal Rio


Collected Statistics:average RTT per call

Average RTT per call (ms)


Rio Natal

Natal Rio


Statistics Role Automatic alarm generation in

beginning/end of calls Report generation

Usage, service characteristics, performance metrics, traffic matrix, etc

Support backbone engineering and QoS configuration and planning


Quality of voice can be determined through quantitative metrics , summarized thru a mean opinion score (MOS) A number in range 1-4.5 E-Model [ITU-T G.107 e ETSI ETR250]

Measurements will help to study and validate extensions to E-model to take in account loss and rtt distributions, besides human timely dependency in quality perception

Voice Quality Monitoring


Voice Quality Monitoring Active monitoring

Its is not a real conversation, but a message played at source and recorded at destination

Useful for baseline assessment, comparative analysis of different QoS configurations, testing and debugging activities


Active Monitoring Tool Allows up to 254 simultaneous calls, different codecs and sizes of

jitter buffer Saves recorded .wav for subjective comparison with original msg Statistics collected thru RTP and RTCP logs Based on OpenH323 answering machine, C++ code


Visualization Javascript environament to

select measure based on direction and codec;

Aggregate statistics per day showing max, min, average and standard deviation;

Zoom for a specific measure;

Automatic graphics generation using Perl with GD.pm e GDGraph.pm


Per Day Visualization

RTT (Round Trip Time) Packet Loss Jitter

13/11/02, entre Brasília e Rio


Specific Measure Visualization


Statistics Search


Mean Opinion Score (MOS)
















Voice Quality Monitoring Passive monitoring of real calls

Capture statistics from real calls H.323 sniffer detects H.323 flows in any

point in the network and model call leg QoS• Cooperation agreement with Telchemy (

www.telchemy.com)• Present MOS based in extended E-model


Passive MonitoringTool Architecture

PSTN

router

GW GKPC

router

GW GKPC

Institution A

Institution B

Internet

agent

agent

SNMP Management

WSagent

agent


Passive MonitoringTool Implementation Modules

H.323 and RTP/RTCP interpreters • OpenH323 library• Concepts of DUMP323

Packet capture • PCAP library

SNMP agent• NET-SNMP library

MIB• RAQMON framework

Objective Voice Quality Evaluation • In first step using VQmon library from Telchemy• Further E-model extensions being developed in house


Advanced VOIP WG (out/03 a out/04) Focus on scalability issues

Call Admission Control (CAC) GK and DNS integration SIP support and H.323/SIP gateway

operation Sophisticating authentication and

authorization procedures thru GK and LDAP integration


Documentation Site www.voip.nce.ufrj.br There is an english version

Documents

Internet2 Fall 2003GT-VoIP/RNP1 VoIP deployment in RNP: experience and future developments Paulo Aguiar GT-VoIP/RNP