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1Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. Voice over IP (VoIP) Brian Gracely Technical Marketing Engineer.

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Presentation on theme: "1Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. Voice over IP (VoIP) Brian Gracely Technical Marketing Engineer."— Presentation transcript:

1 1Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. Voice over IP (VoIP) Brian Gracely Technical Marketing Engineer

2 © 2001, Cisco Systems, Inc. All rights reserved. 2 2 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 2 Agenda Why VoIP? Comparing & Understanding the VoIP Protocols - H Skinny - MGCP - SIP SIP Tutorial Sample VoIP Applications Cisco VoIP products

3 © 2001, Cisco Systems, Inc. All rights reserved. 3 3 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 3 Why VoIP? The Interesting Stuff Telecommunications Act of Deregulation of the Bell networks - Open the competitive markets for Service Providers Converged Networks - Voice, Video & Data over an IP network - Reduced the costs of managing parallel networks - Allows voice to be an IP “application” Centralized or distributed architectures - Add features where they are needed

4 © 2001, Cisco Systems, Inc. All rights reserved. 4 4 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 4 Why VoIP? The Challenging Stuff Do we need to replicate all the existing PSTN / PBX features? What’s the right architecture? - Centralized - Distributed - Mix of both How do we? - Provide better than PSTN QoS - Provide Admission Control - Secure the signaling & media - Meet all the regulatory requirements

5 © 2001, Cisco Systems, Inc. All rights reserved. 5 5 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 5 Open Packet Telephony TDM/ Circuit Switch Digital Trunk Subsystem Subsystem LineConcentrationLineConcentration AdministrationMaintenanceBillingAdministrationMaintenanceBilling Call Control Connection Control Features Call Control Connection Control Features Common Channel Signaling Complex Common Channel Signaling Complex Switching Network Standards-Based Packet Infrastructure Layer (IP, ATM) Standards-Based Packet Infrastructure Layer (IP, ATM) Open Call Control Layer (SIP, H.323, MGCP, etc.) Open Call Control Layer (SIP, H.323, MGCP, etc.) Open Service Application Layer (JAIN, AIN, TAPI, JTAPI, XML etc.) Open Service Application Layer (JAIN, AIN, TAPI, JTAPI, XML etc.) Open/Standard Interface

6 © 2001, Cisco Systems, Inc. All rights reserved. 6 6 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 6 The World Is Now Global— All Apps Must Travel Time and Distance ApplicationsApplications Call Processing InfrastructureInfrastructure Clients IP SoftPhone PSTN gateways Analog phone support DSP farms IP Network PSTN Directory Call Processing Cisco Unity Voice Mail, UMS Intelligent Contact Manager IP IVR, IP AA Apps Engine Voice Portal ICM Collaboration Video AVVID Architecture - Open Packet Telephony GK

7 © 2001, Cisco Systems, Inc. All rights reserved. 7 7 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 7 Agenda Why VoIP? Comparing & Understanding the VoIP Protocols - H Skinny - MGCP - SIP SIP Tutorial Sample VoIP Applications Cisco VoIP products

8 © 2001, Cisco Systems, Inc. All rights reserved. 8 8 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 8 VoIP Signaling Protocols H ITU standard, ISDN-based, distributed topology - 90%+ of all Service Provider VoIP networks - The current interconnect for CallManager to Service Providers - Useful for video applications Skinny - Centralized Call-Control architecture. - CallManager controls all features. - over 700,000 IP Phones deployed MGCP - IETF RFC Centralized Call-Control Architecture - Call-Agents (MGC) & Gateways (MG) SIP - IETF RFC Distributed Call-Control - Used for more than VoIP…SIMPLE: Instant Messaging / Presence

9 © 2001, Cisco Systems, Inc. All rights reserved. 9 9 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 9 Gatekeeper AGatekeeper B RRQ/RCF ARQ RRQ/RCF LRQ IP Network Phone A Gateway A Gateway B H.225 (Q.931) Setup H.225 (Q.931) Alert and Connect H.245 RTP ACF LCF V V Basic H.323 Call V V ARQ ACF Phone B

10 © 2001, Cisco Systems, Inc. All rights reserved. 10 © 2001, Cisco Systems, Inc. All rights reserved. 10 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 10 PSTN Cisco CallManager IP WAN Voice Mail Server Call Setup E.164 Lookup Ring Off Hook RTP Stream Ring Back Basic Skinny Call H.323/MGCP Gateway

11 © 2001, Cisco Systems, Inc. All rights reserved. 11 © 2001, Cisco Systems, Inc. All rights reserved. 11 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 11 MGCP Architectures & Mixed Protocols PSTN BTS / VSC SS7 PSTN Gateway SIP or H.323 Network V Access Gateway SCP MGCP V SIP H.323 IMT PRI RTP SIP / H.323 GK V PSTNPSTN

12 © 2001, Cisco Systems, Inc. All rights reserved. 12 © 2001, Cisco Systems, Inc. All rights reserved. 12 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 12 Agenda Why VoIP? How does it work & why is it interesting? Comparing & Understanding the VoIP Protocols - H Skinny - MGCP - SIP SIP Tutorial Sample VoIP Applications Cisco VoIP products

13 © 2001, Cisco Systems, Inc. All rights reserved. 13 © 2001, Cisco Systems, Inc. All rights reserved. 13 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 13 Why are we talking about SIP? Cisco has never met a protocol it didn’t like…. - Customers haven’t chosen 1 protocol to define VoIP SIP is a very Internet friendly protocol, and Cisco likes Internet friendly stuff…. - SIP reuses a lot of Internet protocols & formatting Customers still weary about proprietary protocols…. - Skinny works well, but it is proprietary It’s about the Applications!! - The next “Killer App” is the integration of voice, data, video, IM & Presence… SIP can do this. Microsoft!! 250 millions desktops might speak SIP soon…. - SIP client will be added to WindowsXP in October

14 © 2001, Cisco Systems, Inc. All rights reserved. 14 © 2001, Cisco Systems, Inc. All rights reserved. 14 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 14 The history of SIP Session Initiation Protocol (SIP) is defined via RFC2543 on March 17, Additional “feature” drafts have been written to address issues which concern SS7/ISUP handling, QoS, Alerting, DHCP, 3PCC, Firewalls & NAT, etc… IETF SIP-WG created in September, 1999 RFC2543bis (additions) created in April Vendor interoperability testing done at the semi-annual SIP Bakeoff (8th in August in UK)

15 © 2001, Cisco Systems, Inc. All rights reserved. 15 © 2001, Cisco Systems, Inc. All rights reserved. 15 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 15 The various flavors of SIP RFC “vanilla” SIP - the most commonly deployed & developed by commercial vendors SIP-T - inter Call Agent (MGC) protocol for carrying SS7 / ISUP messaging - basically maps ISUP messaging to a MIME attachment SIP extension from PacketCable - additions to Security, QoS & Privacy areas

16 © 2001, Cisco Systems, Inc. All rights reserved. 16 © 2001, Cisco Systems, Inc. All rights reserved. 16 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 16 SIP Basics - Architecture Legacy PBX SIP User Agents (UA) Application Services LDAP Oracle XML SIP RTP (Media) SIP CPL 3pcc PSTN CAS or PRI INTELLIGENTSERVICESINTELLIGENTSERVICES SIP Proxy, Registrar & Redirect Servers

17 © 2001, Cisco Systems, Inc. All rights reserved. 17 © 2001, Cisco Systems, Inc. All rights reserved. 17 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 17 SIP Basics - Architectural Elements Clients: SIP Phones, Softphones, Gateways, Media Gateway Controllers, PDAs, Robots - User Agent Client (UAC) / User Agent Server (UAS) - Originate & Terminate SIP requests Typically an endpoint will have both UAC & UAS, UAC for originating requests, and UAS for terminating requests Servers: - Proxy Server - Redirect Server - Registrar Server

18 © 2001, Cisco Systems, Inc. All rights reserved. 18 © 2001, Cisco Systems, Inc. All rights reserved. 18 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 18 SIP Servers/Services (cont) SIP User Agents Registrar Redirect Location Database SIP Proxy SIP Servers/ Services REGISTER “Here I am” INVITE “I want to talk to another UA Proxied INVITE “I’ll handle it for you” “Where is this name/phone#?” 3xx Redirection “They moved, try this address” SIP User Agents SIP-GW

19 © 2001, Cisco Systems, Inc. All rights reserved. 19 © 2001, Cisco Systems, Inc. All rights reserved. 19 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 19 SIP Methods Consists of Requests and Responses Requests (unless mentioned, each has a response) REGISTER: UA registers with Registrar Server INVITE: request from a UAC to initiate a session ACK: confirms receipt of a final response to INVITE BYE: sent by either side to end a call CANCEL: sent to end a call not yet connected OPTIONS: sent to query capabilities outside of SDP Newly Adopted Methods: SUBSCRIBE & NOTIFY: used to identify device status / presence. The foundation of SIP IM / Presence (IMPP). INFO: a means of carrying “data”in a message body REFER: the mechanism to initiate a Transfer MESSAGE: the means of carrying “data” for SIP IMPP Messages contain SIP Headers and Body. Body might be SDP or an attachment or some other application

20 © 2001, Cisco Systems, Inc. All rights reserved. 20 © 2001, Cisco Systems, Inc. All rights reserved. 20 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 20 SIP Addressing Modeled after mailto URLs. May be a combination of FQDNs or E.164 numbers or both. Support for Fully-Qualified Domain Names (FQDNs) using sip: URLs - sip: “John Doe” Support for E.164 addresses - user=phone Support for mixed addresses - user=phone Support for E.164 addresses using tel: URLs - tel:

21 © 2001, Cisco Systems, Inc. All rights reserved. 21 © 2001, Cisco Systems, Inc. All rights reserved. 21 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 21 Basic SIP Call-Flow SIP UA1 SIP UA2 INVITE w/ SDP for Media Negotiation 100 Trying 180/183 Ringing w/ SDP for Media Negotiation 200 OK BYE MEDIA ACK

22 © 2001, Cisco Systems, Inc. All rights reserved. 22 © 2001, Cisco Systems, Inc. All rights reserved. 22 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 22 Basic SIP Functionality - Call Forking LOCAL PSTN Proxy / Redirect Server Location Database INVITE “Where is “Contact and INVITE INVITE INVITE Forked Calls can be in parallel or sequential. The first phone to answer will get the call, the others will get a CANCEL from the Proxy Server.

23 © 2001, Cisco Systems, Inc. All rights reserved. 23 © 2001, Cisco Systems, Inc. All rights reserved. 23 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 23 Basic SIP Functionality - Call Redirection LOCAL PSTN Proxy / Redirect Server Location Database INVITE “Where is “You need to contact ” 3xx Moved Contact: INVITE National PSTN The user at informed the network that he could be reached on his cell-phone at The user at informed the network that he could be reached on his cell-phone at

24 © 2001, Cisco Systems, Inc. All rights reserved. 24 © 2001, Cisco Systems, Inc. All rights reserved. 24 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 24 3rd-Party Call-Control (3pcc) & Back-to-Back UserAgent (B2BUA) LOCAL PSTN SIP Controller - 3pcc Application INVITE sip:1234 w/o SDP x x / 200 OK w/ SDP INVITE sip: w/ SDP of SIP Phone 18x / 200 OK w/ SDP ACK w/ SDP of SIP Gateway A user could manage their communications via a webpage. The webpage would invoke the SIP 3PCC application to create SIP sessions to all parties involved. HTTP post

25 © 2001, Cisco Systems, Inc. All rights reserved. 25 © 2001, Cisco Systems, Inc. All rights reserved. 25 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 25 Agenda Why VoIP? How does it work & why is it interesting? Comparing & Understanding the VoIP Protocols - H Skinny - MGCP - SIP SIP Tutorial Sample VoIP Applications Cisco VoIP products

26 © 2001, Cisco Systems, Inc. All rights reserved. 26 © 2001, Cisco Systems, Inc. All rights reserved. 26 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 26 Web Pages Enterprise Database Application Toolkit External Services Packaged Solutions IP IVR Voice Portal Auto Attendant Telephony Directory Access Web Access DB Access LDAP Notification Server Queuing Paging VXML services ICM Notification Services Queuing (ACD) Personalized Apps Customer Apps Notification Services Queuing (ACD) Personalized Apps Customer Apps Unity Application Engine Architecture

27 © 2001, Cisco Systems, Inc. All rights reserved. 27 © 2001, Cisco Systems, Inc. All rights reserved. 27 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 27 IP Telephony Appliance - Corporate directory integration via LDAP - Web site integration via XML - Personalized menu’s via softkeys Extensible interface with IP services offers clear differentiation to PBX connected devices IP Phone Display Applications *

28 © 2001, Cisco Systems, Inc. All rights reserved. 28 © 2001, Cisco Systems, Inc. All rights reserved. 28 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 28 Convergence:Presence Services Managing your communications through web browsers, Instant Messaging and mobile devices

29 © 2001, Cisco Systems, Inc. All rights reserved. 29 © 2001, Cisco Systems, Inc. All rights reserved. 29 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 29 Remote Agents SoftPhone IP Phones PSTN IP Central Site IAQ Server Branch Agents Distribution Groups with Queuing for Resources 2 Types of Queues Requestor Servicer Informal Agent Queuing (IAQ)

30 © 2001, Cisco Systems, Inc. All rights reserved. 30 © 2001, Cisco Systems, Inc. All rights reserved. 30 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 30 Web Attendant Ubiquitous access via a browser Extension look-up via LDAP Easy of use with drag and drop interface Benefits: Eliminates specialized receptionist phones Access via URL Included with Call Manager 3.0(tbd)

31 © 2001, Cisco Systems, Inc. All rights reserved. 31 © 2001, Cisco Systems, Inc. All rights reserved. 31 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 31 IP Intranet Voice Portal Solution Extracts XML information from web page into IP IVR Benefit Only one place to configure and maintain data Consistency Lower admin costs Press #1 to Hear Stock Quote IP IVR Stock Quote *

32 © 2001, Cisco Systems, Inc. All rights reserved. 32 © 2001, Cisco Systems, Inc. All rights reserved. 32 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 32 VoiceXML PSTN Cisco Voice Gateway RTSP Server VoiceXML in IOS: HTTP Server Architectural Model: VXML Interpreter Context Document Server Implementation Platform VXML Interpreter

33 © 2001, Cisco Systems, Inc. All rights reserved. 33 © 2001, Cisco Systems, Inc. All rights reserved. 33 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 33 Agenda Why VoIP? How does it work & why is it interesting? Comparing & Understanding the VoIP Protocols - H Skinny - MGCP - SIP SIP Tutorial VoIP Applications Cisco VoIP products

34 © 2001, Cisco Systems, Inc. All rights reserved. 34 © 2001, Cisco Systems, Inc. All rights reserved. 34 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 34 Cisco VoIP Products Call-Processing - Cisco CallManager - Multimedia Conference Mgr - H.323 Gatekeeper / Proxy - Cisco SIP Proxy Server (CSPS) - BTS10200 Softswitch - VSC3000 Softswitch VoIP Gateways - Low End: ATA 186, 827v4, CVA122, uBR924, 1750, VG200 - Mid Range: 3810, 2421, 2600, 3600, Cat4000, AS5300, 7200, High End: AS5350, AS5400, Cat6000, AS5850, MGX8850 IP Phones , 7940, 7960, 7935, Softphone Applications - Unity UM, Personal Assistant, Conference Connection, IP IVR, IP Contact Center, Web Attendant, XML / BTXML on IP Phones EcoSystem partners Cisco Infrastructure - IOS QoS features, Line-Powered Catalyst Switches, Catalyst QoS features - Application Layer Gateway (ALG) in IOS-NAT / Firewall, PIX

35 © 2001, Cisco Systems, Inc. All rights reserved. 35 © 2001, Cisco Systems, Inc. All rights reserved. 35 Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. 35 Questions?

36 36Internet2_VoIP © 2001, Cisco Systems, Inc. All rights reserved. Voice over IP (VoIP) Brian Gracely -

37 37 Presentation_ID © 2001, Cisco Systems, Inc. All rights reserved.


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