Nortel converged office introduction1


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Introduction to the Nortel Converged Office Solution.

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Nortel converged office introduction1

  1. 1. Nortel Converged Office: Solution Overview: Although fairly new in concept…and in relative infancy in it’s adoption and deployment in the Enterprise, there are nevertheless a number of solutions currently available from a variety of vendors that offer the promise of true, integrated Multimedia communication – the premise to Unified Communications. And the key word behind Unified Communications is of course integration. It is this level of integration that differentiates one solution providers offering from another. A fully integrated, presence enabled communication system associates with hardware such as PC’s, telephones and mobility devices, and applications such as IM and e-mail typically on the foundation of communications platform that can handle, voice, video and data – something that is becoming more available with IP telephony and converged networks. What would this actually offer your business environment? Just imagine if the once separate services and hardware requirements for phone, video conferencing, voicemail, IM, fax e.t.c were suddenly integrated into one service with minimum inconsistencies in hardware platforms. Essentially the integration of disparate communications and media, desktop applications, computers and mobility. One part of a Unified Communications solution offering from Nortel is the Nortel Converged Office: a solution brought about by the combination of the Nortel Communication Server 1000E telephony system and the Microsoft Office Communications Server 2007 platform. This effectively creates a SIP- based VoIP solution which capitalises on Microsoft Office 2007 Desktop Software accessing the business-grade telephony services and features provided by the Nortel CS100E. Where Microsoft OCS2007 typically provides the Applications for UC in an organisation’s internal LAN/WAN environment, for users to have the ability to make calls to and from the external PSTN, interoperation to a third-party vendors SIP to PRI gateway is required. In this scenario however, the telephony features the users have access to are limited to what the SIP protocol allows for….usually a severely diminished featureset of an enterprise class PBX. The Nortel Converged Office solution has come about as a result of the Innovative Communications Alliance between Nortel and Microsoft forged in 2007 to co-develop products and services in many aspects, including R&D. A fully integrated, streamlined solution between these vendors systems has emerged, as opposed to just interoperation by the OCS 2007 to other manufacturer’s voice systems.
  2. 2. Users of the Nortel Converged Office have access to a powerful suite of Nortel CS100E features which include: • Nortel Unified Messaging (supported by Microsoft Exchange Server) • Contact Center • Interactive Voice Response • Nortel Multemedia Conferencing Microsoft OCS2007 allows users to have Instant Messaging, Tele-Presence VoIP Telephony Presence at the desktop. The Nortel Converged Office Solution integrates a number of elements to provide a feature-rich multimedia environment: 1. The Nortel Communication Server 1000E – A highly reliable, VoIP Enterprise PBX. It is comprised of some basic components: • Call Server – Core Switching element of the CS1000E • Signalling Server - The various tasks this component provides is a Terminal Proxy Server for IP telephone sets, it provides SIP signalling on behalf of the Call Server, it functions as “virtual trunks” within the CS100E architecture and is also seen as CS1000E Gateway providing access to TDM and PSTN • Network Routing Service – The NRS can act as an H.323 Gatekeeper, and provide for either SIP Proxy Server (SPS) function or a SIP Redirect Server (SRS) functions. • Media Gateway – This predominantly transitions IP to TDM for PSTN access. It supports analogue and digital telephones and trunks and supports Secure Real-Time Protocol (SRTP) with Media Gateway Controller Card (MGC) and Voice Gateway Media Card (MC32S 2. Nortel Multimedia Converged Manager (MCM) – This is the key component of the whole Nortel Converged Office solution, as it provides communications between the CS100E and the OCS2007. It is a Nortel application that runs on top of OCS2007 Proxy Server. This MCM/Application Proxy Server will be a standalone computer in either the Standard or Enterprise Edition Deployments The MCM core functions are to perform translations between Directory Numbers (DN’s) and User ID’s with Active Directory, provide authentication for RCC as well as also being used for Numbering Plan Normalisation.
  3. 3. 3. Nortel Multimedia Conferencing (NMC 5.0) – The NMC is a SIP based application solution which provides Audio and Video Conferencing. It augments the existing conference capabilities offered natively by the OCS2007 by offering ubiquitous access from multiple access points – PSTN, SIP hard clients, SIP soft clients, and supports video on Office Communicator. It utilises software based Digital Signal Processors (DSP’s), and has a standalone capability. 4. Microsoft Applications for UC - Microsoft Office Communications Server 2007 (OCS2007) Standard and Enterprise Edition. These include: • OCS2007 Application Proxy Server - Required for Nortel MCM • OCS 2007 Front End Server (FE Server) - Interfaces to OCS2007 clients and provides them with multimedia features. It communicates directly with Nortel MCM allowing for seamless integration of the Communicator clients to Nortel telephony services. Other functions include: User Services – Reverse number lookup for incoming phone calls. User Replicator – Extracts user phone numbers from Active Directory and Address Book Service – normalises phone numbers to E.164 format. • OCS2007 Mediation Server – The Mediation Server provides a number of functions, including SIP signalling and RTP media translations, SRTP encryption within OCS2007 and RTP/RTCP to SIP Gateway Endpoints and OCS2007 clients. For transport purposes, it translates SIP to TCP on the CS100E Gateway side, and SIP over MTLS on the OCS2007 side. It is required for media translation, converting to and from G.711 on the CS100E Gateway side and RT Audio on the OCS2007 side. It also connects clients outside the network to Internal Interactive Connectivity Establishments (IICE) which then enables media traversal of NAT and Firewalls • OCS2007 Active Directory Server – Fundamental in a Microsoft environment, Active Directory performs a number of tasks including storing Global Settings and Groups necessary for the deployment of OCS2007. It has a centralised database which maintains Authentication and Authorisation services within a domain and also assigns Policies to users It is important to note that dependent on deployment options, Standalone or Enterprise Edition on the OCS2007 for example, other components such as a standalone SQL server may be required and also Nortel Application Switch (NAS) for hardware load balancing. So it is these two, up till now disparate and technologically distinct entities -the telephony world of Nortel and Microsoft’s application environment - that the Nortel Converged Office merges. This enables users to originate and receive
  4. 4. telephone calls over existing CS1000E phones from a Microsoft OCS2007 Desktop Client, as well as having the capability to make and receive PSTN calls from this OCS2007 soft client when away from the office. The benefits of Nortel Converged Office is it’s provision to users of a powerful, feature-rich telephony and multimedia solution which improves worker productivity and efficiency by integrating popular Microsoft Office applications such as e-mail and Instant Messaging with VoIP Desktop Phones and Clients. NCO Solution Basic Architecture NMC 5.0 Active Directory NRS (SPS/SRS) Mediation Server MCM/Application Proxy Server CS1000E IP Phones Office Communicator 2007 Front End Server Nortel Microsoft Solution Core Features and Functionality: You can access the functionality of this solution in either of two modes: Remote Call Control, for mainly office based users who use a deskphone, and Telephony Gateway and Services, suitable for users who are perhaps more mobile, allowing them to use their PC for voice calls. So, Nortel Converged Office facilitates Remote Call Control (RCC) with SIP CTI (TR/87) which provides full Microsoft Office Integration to control Nortel IP phones from the Microsoft Office 2007 applications. It also allows for Telephony Gateway and Services, where the Nortel CS100E provides the Private and Public Telephony Network access for the OCS2007 Clients. RCC (also known as “RCC-mode” or “phone-mode”) is where incoming calls are “twinned” to the OCS2007 Client and the CS1000E phone. Users have the flexibility to control Call Functions directly from Microsoft 2007 Applications – controlling the IP phone from the Communicator client for example. The Nortel CS1000E Signalling Server performs the SIP CTI (TR/87) functionality.
  5. 5. Outgoing calls in this mode can be initiated using click-to-call functionality from the Office Communicator Client, (also integrated into the Msft Outlook application) the call then being instigated from the phone. Telephony Gateway Services (also known as “VoIP mode”) is where Nortel Converged Office users have Business grade telephony services made available to them by utilising the CS1000E switch as a SIP Gateway. The CS1000E provides IP media conversion to the PSTN. In this scenario, users can choose to use the OC2007 Client or the CS1000E phone. They also have immediate access to Nortel provided dial plan, VoIP infrastructure, and telephony features. A Personal Call Assistant (PCA) is required to support this functionality. The PCA extends many of the Nortel CS100E features to the OCS2007 Communicator, such as: • Numbering Plan translations • Call Detail Recording (CDR) • Call Forward No Answer • Attendant Recall • Group Call
  6. 6. Also, phones are not required if the Office Communicator is available to the users. This however has the effect of the full Enterprise telephony featureset not being available to the user – only the basic telephony functionality provided by SIP. The Nortel Communications Server 1000E VoIP PBX is scalable to meet the customer needs. An integral part of the solution is the Nortel Multimedia Converged Manager (MCM) which ensures interoperability between the CS100E and the OCS2007. Nortel Multimedia Conferencing (NMC) provides SIP-based audio and video conferencing features. The Nortel Converged Office provides users: • Instant Messaging • Enhanced Presence – NCO users can provide more info regarding their own status; even when in RCC mode when the phone is on or off hook for example. Users experience enhanced presence in Msft applications as well as the Office Communicator. • Group IM – Allows for conferencing of two or more parties. Group IM is provided for by the Msft Conferencing Server • Integration with Microsoft Office 2007 Applications (Word, Excel, Outlook, Sharepoint) • Microsoft Office 2007 Communicator NCO Components CS1000E – SIP Gateway NRS (SPS/SRS) SIP Signalling Server/SIP Gateway pbxLink SIP Call Server pbxLink MCM/Application Proxy Server Media Gateways SIP RTP RTP End Users PSTN Another feature of the Nortel Converged Office solution is Integrated Unified Messaging with Microsoft Exchange 2007.
  7. 7. Microsoft Exchange Server 2007 integrates e-mail, voicemail and fax into a centralised location for users. Users access these messages within their Office Outlook 2007 or Outlook Web access. Users are offered the advantage of the interoperability features between the CS1000E Telephony Services and the Unified Messaging Solution provided by the Msft Exchange Server 2007. A few points of note: For Integrated Unified Messaging to Microsoft Exchange 2007 to work the only supported codecs are G7.11 and G7.29, and Exchange Server 2007 must be configured as a static endpoint on the NRS as dynamic registration is not supported in this instance. In addition, for Message Waiting Indicator (MWI) functionality for OCS2007 users on soft clients, a third-party add-on is required, Geomant MWI 2007. Solution Deployment Options: Deployment considerations depend on the size and requirements of your organisation, and there are various options on how the Communications Server1000E and Nortel Converged Office could be deployed to satisfy user criteria. A few options are: CS1000E Single Site Deployment – This is a simplified deployment that is easily managed and allows for future growth. It includes a CS1000E with either Standard Availability or High Availability Call Servers, Signalling Servers, Media Gateways and IP phones CS1000E Multi Site Deployment – This includes multiple CS1000E’s and supports Campus and geographically distributed (remote) customer sites. It also includes Primary, Alternate and Failsafe NRS to provide a centralised Dialling Plan. Each CS1000E supports Gateway access to the PSTN. CS1000E Geographic Redundancy – The use of Survivable Media Gateway’s (SMG) enhances the CS1000E reliability by allowing up to 50 geographically remote Call Servers to one Primary Call Server. These SMG’s are configured with one Primary Call Server and/or two Alternate Call servers. Secondary Call Servers allow for two levels of redundancy for the IP and TDM devices assigned to it. Triple IP registration for redundancy is also provided for by the SMG’s. Where required, Campus Redundancy is also provided for: This is the ability to Geographically divide a CS1000E High Availability over a campus environment. NCO Small Network – CS1000E deployment In this scenario, deployment options may include a Standard Availability CS1000E system, comprised of the basic components, a Signalling Server, Media Gateway and IP phones.
  8. 8. NCO Small Network – OCS2007 Standard Edition deployment. Deployments of this size are to support up to 5000 users and is recommended to customers who do not require any redundancy. Typical OCS2007 SE components would include an OCS2007 Application Proxy Server running MCM, a Front End Server, a Mediation Sever and Active Directory. NCO – OCS2007 Enterprise Edition Medium and Large network deployment considerations. Recommended for enterprises with more than 5000 users and require High Availability. OCS2007 EE components would include Active Directory, OCS 2007 Application Proxy Servers running MCM, Front End Servers, Mediation Servers, SQL Servers and Nortel Application Switches. Specifically for OCS2007 Enterprise Edition, two types of Pool configurations are supported: • Enterprise Edition Consolidated Configuration – Here, all the server functionalities/Roles on each Enterprise Edition Server are combined within a pool. This configuration would provide for simplified management and deployment and also reduce the number of physical servers required, while still maintaining High Availability for users. However, reduced system performance on a per computer basis would be experienced due server consolidation. • Enterprise Edition Expanded Configuration – Each Server component is deployed on a separate physical server/computer with many pools. This High Availability configuration provides users with increased scalability and maximum performance, however also increases the deployment complexity and management. Nortel Converged Office supports both OCS2007 EE Consolidated and Expanded deployments.
  9. 9. NCO Architecture CS1000E with MS Office 2007 Enterprise Edition Deployment NMC5.0 Active Directory NRS (SPS/SRS) MCM/Application Proxy Server Nortel CS1000E SQL Server Application Mediation Server FE Server Pools Switch IP Phones Pools Pools Pools Users Nortel Microsoft A word to customers, integrators and solution providers: We have outlined the components, deployment and advanced integration options of the Nortel Converged Office solution. To extract the real benefits from this type of technology, organisations have to spend time and money to upgrade the basic communications infrastructure, to optimise the results of what this Unified Communications solution brings together. So upfront, these technologies may appear to be expensive if considered through the eyes of accountants and financial types. But, these networks deliver more value every day the organisation operates with UC enabled solutions. Thus, people such line managers and staff using the system are presented with the challenge of proving the value of this more complete solution. If this bridge is successfully gapped, you will preserve profit margins and maintain a competitive position in the market. We here at Unified believe this so strongly, that it will support it’s customers in this educational process, through white papers, technology presentations and in some cases person-to-person assistance in sales calls. But we pledge that if we see an installation that is high risk for from an application point of view, we will steer you from it. Why? Because nobody – you, your customer or Unified needs those complications. And, while Unified Communications is new to most people and you and customers may have many questions, we will endeavour to provide satisfying, understandable answers.
  10. 10. For more information on the Nortel Converged Office, OCS or CS1000E please contact .