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… and possible roles of the NRN

VoIP scenario’ s within NRN

networks

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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 infrastructure 2) VoIP on the Campus

3) VoIP between Campus locations 4) Trunk termination

5) Outsourced PBX

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Campus

0) Traditional Campus infrastructure

PBX

Rest of Telephony

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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

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Campus

1) VoIP on the campus

LAN

iPBX

Rest of Telephony

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1) VoIP on the campus

• 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)

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2 VoIP between locations

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

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• If the institution has PBXs

2a VoIP between locations

NRN Location 2 PBX GW Rest of Telephony world Location 1 PBX GW Other call s Internal calls Other calls

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• If the institution has a iPBX

2b VoIP between locations

Location 2 Location 1 iPBX LAN LAN NRN Rest of Telephony world Internal calls Other calls

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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:

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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

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NRN

Campus

3a) VoIP trunk termination

iPBX Rest of Telephony world Carrier GW Call Control Campus PBX GW

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3a) VoIP trunk termination

• Role

– IP carrier • Impact

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

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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

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NRN

3b) VoIP trunk termination

Rest of Telephony world GW Call Control Campus iPBX Campus PBX GW

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3b) VoIP trunk termination

• Role

– IP carrier – Voice carrier • Impact

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

(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’

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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

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4a) VoIP as outsourced service

Rest of Telephony world Campus LAN WAN (NRN) Service Provider GW iPBX

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4a) VoIP as outsourced service

• Role

– IP carrier • Impact

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

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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

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NRN

4b) VoIP as outsourced service by NRN

Rest of Telephony world Campus LAN GW Call Control

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4b) VoIP as outsourced service by NRN

• Role

– IP carrier – Voice carrier • Impact

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

(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

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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

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5) VoIP-VoIP routing by NRN

NRN Call Control Campus iPBX Campus iPBX Campus PBX GW Rest of Telephony world Option 0, 2 or 3

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5) VoIP-VoIP routing by NRN

• 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

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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

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Combinations of roles

• Connecting a Campus to the outside world can be done in different ways: * = gateway necessary v v* VoIP v v ISDN30 iPABX PABX Type of PABX Termination

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Legenda and Abbreviations

• GW Gateway, TDM-to-VoIP gateway

• iPBXIP-based PBX (‘ VoIP PBX’ )

• PBX Public Branch eXchange

• PSTN Public Switched Telephone Network

• TDM Time Division Multiplexing, traditional telephony • VoIPVoice over IP, internet telefphony

IP connection TDM connection IP trunk

IP phone TDM phone

References

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