high-quality internet for higher education and research plaats en datum …and possible roles of the...

High-quality Internet for higher education and research

Plaats en datum

…and possible roles of the NRN

VoIP scenario’s within NRN networks

Erik Dobbelsteijn for TERENA TF-VVC


Introduction

• The word ‘VoIP’ both covers a lot of technologies and a lot of possible usage scenarios which lead to confusion

• This document gives an overview of VoIP scenarios that NRNs can encounter and decribes possible roles of the NRN for each scenario:0) Traditional Campus infrastructure1) VoIP on the Campus2) VoIP between Campus locations3) Trunk termination4) Outsourced PBX5) VoIP-VoIP routing by the NRN


Campus

0) Traditional Campus infrastructure

PBXRest of

Telephonyworld


1) VoIP on the campus

• Instead of a traditional (TDM) PBX, a VoIP-based iPBX dispatches all telefphone traffic

• Telephones are connected to the iPBX through the institutional LAN

• Calls destined outside the campus are carried over ISDN30


Campus


LAN

iPBXRest of

Telephonyworld



• Role:– None– Optional: consulting

• Case for the institution:– Using existing LAN

(but: sometimes separate LAN necessary)– Advanced features– Integration with institutional services (CRM etc)– Easy to work from home (VPN necessary)


2 VoIP between locations

• Instead of sending calls between different locations of one institution ISDN, this can be done over VoIP over NRN.


• If the institution has PBXs

2a VoIP between locations

NRN Location 2

PBXGW

Rest ofTelephony

world

Location 1

PBX GW

Other calls

Internal calls

Other calls


• If the institution has a iPBX

2b VoIP between locations

Location 2Location 1

iPBX LAN

LAN

NRN

Rest ofTelephony

world

Internal calls

Other calls


2b VoIP between locations

• Role:– None– Optional: consulting

• Impact– Availability of the network should be high– Network should be collision free

(so have low latency and jitter)• Case 2a for institution:

– Investment: 2x gateway– Maintenance cost (low)– Savings: inter-location call costs

• Case 2b for institution:– Savings: inter-location call costs


3a) VoIP trunk termination

• Instead of sending calls from an institution to an outside destination (PSTN) over ISDN, this can be done over VoIP. NRN transports VoIP traffic to a commercial carrier that takes care (‘terminates’) it.

• Two ways to connect the campus:– A) iPBX: delivers VoIP to the WAN– B) PBX: a gateway converts TDM calls coming from

the PABX to VoIP, which delivers VoIP to the WAN


NRN

Campus


iPBX

Rest ofTelephony

world

Carrier

GW

CallControl

Campus

PBXGW



• Role– IP carrier


(so have low latency and jitter)


3b) VoIP trunk termination by NRN

• Instead of sending calls from an institution to an outside destination over ISDN, this can be done over VoIP. NRN transports VoIP traffic to a commercial carrier that takes care (‘terminates’) it.

• Two ways to connect the campus:– A) (i)PABX delivers VoIP to the WAN– B) a gateway converts TDM calls coming from the

PABX to VoIP, which delivers VoIP to the WAN


NRN

3b) VoIP trunk termination

Rest ofTelephony

worldGW

CallControl

Campus

iPBX

Campus

PBXGW


3b) VoIP trunk termination

• Role– IP carrier– Voice carrier


(so have low latency and jitter)– NRN might be considered a Voice carrier by regulator,

meaning that NRN should at least support• Number portability• Lawful intercept

– NRN should find cheap carriers to terminate traffic or even participate in ‘wholesale minute market’

– NRN should bill its costumers depending on a tariff model (per minute/flat fee)


4a) VoIP as outsourced service

• An institution does not have an (i)PBX of its own, but rents phones including a telephone number for its employees and/or students from Service Provider

• Institution receives a monthly bill for rent and calls• Service Provider provides call control, institutional

number plan, advanced features, termination, end-user support and billing



Rest ofTelephony

world

Campus

LAN

WAN(NRN)

Service Provider

GW

iPBX



• Role– IP carrier


(so have low latency and jitter)


4b) VoIP as outsourced service by NRN

• An institution does not have an (i)PBX of its own, but rents phones including a telephone number for its employees and/or students from NRN

• Institution receives a monthly bill for rent and calls• NRN provides call control, institutional number plan,

advanced features, termination, end-user support and billing


NRN


Rest ofTelephony

world

Campus

LAN

GW

CallControl



• Role– IP carrier– Voice carrier


(so have low latency and jitter)– NRN is concidered a Voice carrier by regulator, meaning that

NRN should at least support• Number portability• Lawful intercept

– NRN should find cheap carriers to terminate traffic or even participate in ‘wholesale minute market’

– NRN should bill its costumers depending on a tariff model (per minute/flat fee)

– NRN should have end-user support desk– Billing


5) VoIP-VoIP routing by NRN

• Inter-institutional VoIP-VoIP calls can be routed by NRN independent of VoIP-to-PSTN traffic flows

• PBX: gateway at campus necessary• iPBX:

– H.323: through GDS (already in place)– SIP: under development at NRN



NRN

CallControl

Campus

iPBX

Campus

iPBX Campus

PBXGW

Rest ofTelephony

world

Option 0, 2 or 3



• Role– IP carrier– Call Control/Trusted Third Party

• Impact– Inter-instutional traffic is small– Bussiness case to place gateways at campuses that

don’t have VoIP has proved negative previously– Availability of the network should be high– Network should be collision free

(so have low latency and jitter)– NRN should have wholesale support desk– Billing


Other roles

• Extend functionality (to the end user): IM/Presence• Authentication infrastructure to authenticate end-users• Authorisation infrastructure to control sessions• VoIP retail/end user services like

– Pilmo.nl– Optibel.nl

• Not considered: closed VoIP systems like:– Skype– VoIPster

4


Combinations of roles

• Connecting a Campus to the outside world can be done in different ways:

* = gateway necessary

vv*VoIP

vvISDN30

iPABXPABX Type of PABX

Termination


Legenda and Abbreviations

• GW Gateway, TDM-to-VoIP gateway• iPBX IP-based PBX (‘VoIP PBX’)• PBX Public Branch eXchange• PSTN Public Switched Telephone Network• TDM Time Division Multiplexing, traditional

telephony• VoIP Voice over IP, internet telefphony

IP connectionTDM connectionIP trunkTDM Trunk

IP phoneTDM phone

high-quality internet for higher education and research plaats en datum …and possible roles of the...

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