VoIP Technology Briefing

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Presentation transcript:

VoIP Technology Briefing Harpal Chohan Russell Morrison Enterprise Networking - The Ohio State University

Agenda Voice as an application Overview of the PSTN VoIP toll by-pass IP Telephony Integrated Voice Architecture

Voice – What is it? Real-time, interactive An application – Not a network Characteristic Issues:- Real-time, interactive Delay Intolerant – delay < 150 ms Jitter, packet loss

Constituent Pieces Media Signaling Services

Agenda Voice as an application Overview of the PSTN VoIP toll by-pass IP Telephony Integrated Voice Architecture

Media - Analog PSTN CO/ PBX - Digital G.711 64 k (DS0) G.726 16, 24, 32, 40 k G.729 8 k G.728 16 k G.723.1 6.3/5.3 k Variable

Signaling Analog ISDN Q.930/Q.931 SS7 Signaling CO Switch CO Switch PBX ISDN PSTN – SS7 PRI Office Media Transport Home

SS7 Elements SS7 Signaling SSP SSP Sig. & Switch Voice PBX Voice SCP STP SS7 Signaling SSP SSP Sig. & Switch Voice PBX Voice Switch

SS7 Protocol Stack OSI Layer SS7 Level TCAP ISUP TUP SCCP MTP

Agenda Voice as an application Overview of the PSTN VoIP toll by-pass IP Telephony Integrated Voice Architecture

Where does IP come in? Toll Bypass V PSTN IP Network H.323 PBX PBX Router V

Multi-site VoIP PSTN Gatekeeper SS7 ISDN IP WAN ISDN H.323 PBX A PBX B PBX C

Motivators for Enterprise VoIP Toll bypass – of course. Single wide area infrastructure – gotta have data connectivity anyway. Right? Consolidation of long distance volume. Custom dial plan (5 digit across all locations). Network Consolidation.

Agenda Voice as an application Overview of the PSTN VoIP toll by-pass IP Telephony Integrated Voice Architecture

IP Telephony PBX/ Gateway PSTN IP PBX Switch Enterprise IP Network Remote Campus IP Phones

Motivators for IP Telephony Single campus network infrastructure Portability – easy adds/changes IS Staff supporting voice and data?? Unified Messaging Integrated services and features

IP Telephony Migration Voice Mail PSTN PSTN IP PBX Enterprise IP Network PBX Gateway Enterprise Phone Network IP Phones Voice Mail

IP-Tel/VoIP at Ohio State PBX PSTN PSTN IP PBXs OSU Phone Network Voice Mail Gateway OSU Campus Network IP T1s Remote Sites IP Phones

Usual Deployment Issues State of In-building networks Firewalls 911 Power Change management – record keeping Dial Plans

Dial Plans Toll bypass VoIP – Phones already have E.164 identities IP Phones – Have IP addresses, and?

Talking Outside Your Realm PSTN IP PBX IP PBX Internet2 Enterprise IP Network Enterprise IP Network

Talking Outside Your Realm PSTN IP PBX IP PBX Internet2 Enterprise IP Network Enterprise IP Network

Agenda Voice as an application Overview of the PSTN VoIP toll by-pass IP Telephony Integrated Voice Architecture

VoiP Constituent Pieces Media, Transport & Gateways Gateway Control and signalling Services

Integrated Voice Architecture Open Services Layer Services SS7, ISDN, Q93x H.323, SGCP, IPDC, MGCP, SIP Control TDM, ATM, etc. RTP/UDP/IP Gateways Transport