Cisco Voice & Unified Communications Overview

hello and thank you for watching our video on voice and unified communications at a high level presented by a trout hub before we can talk about some of the protocols and features let's talk about some of the main components that you would see in a voice and unified communications environment the main components are call control or call processing endpoints voice gateway and voice applications the main component the most critical component listed is the call processing component it is responsible for for connecting the other components together it is responsible for registration cost set up call it teardown and providing a wide variety of voice features and capabilities for the environment some hardware examples are the Cisco Unified Communication Manager or call manager and the cisco call manager express endpoints or IP phones are devices that an end-user will have with their associated phone number some harbour examples of that are the Cisco IP 7970 and the 79 60 models including the Cisco IP communicator which is the software version of the IP Phone the voice gateway connects directly into a PSTN or a phone provider for placing and receiving external calls some harbour examples are the Cisco IOS our 1861 the 2800 series the 3800 series and the cisco unified communications 520 model recommended for small and SMB businesses then you have voice applications and the main applications that are used are voice and unified messaging which provides voice mail capabilities including auto attendant and some harbour examples are the cisco unity and cisco unity express call center is used for help desk or for technical support centers that want to have call queues and various scripts for various call routing requirements an example would be the cisco contact center Express or the Enterprise version and there's other kind of applications related to advanced conferencing utilizing Cisco meeting-place Express and so forth so these are the main components that you will see in a voice and unified communications environment in terms of protocols there are two main types of protocol based on their groups there is voice control and voice data voice control is responsible for car registration cost setup called teardown and access to various features and capabilities available within the environment for example there it can be skinny or sccp which is a cisco base voice control protocol so this is what the IP phones are using to connect to the call manager server and for placing and receiving phone calls sip and HD 23 are the industry standard voice control protocols where sip is more widely used in today's industry mgcp is a voice control protocol that is mainly used between the voice gateway and a call manager solution a call processing component to provide a dynamic call routing throughout a PSTN when a call is set up using one of the voice control protocols the actual phone conversation occurs this is the actual voice data and the actual protocol is the RTP and that consists of an RTP stream so both of these are protocols that are seen in a voice Network voice gateway so a voice gateway can talk back to the call processing component via SIP h.323 or mgcp again it is recommended that mgcp is used for the call control protocol for dynamic call routing throughout the PSTN always gateway could also have a wide variety of ports that can be analog or digital connecting to the PSTN for Allah it could be an FX o or in of excess the fxo is an analog line that connects directly into like a phone jack that connects directly into the phone provider that is associated that phone line is associated with ad ID or phone number and fxs is used for connecting analog devices such as analog phones or fax machines a digital line will be an ICMP RI which can place and receive up to 23 cause at a given time horizon connection and here is a diagram that puts all this that we talked about in terms of components protocols and aspects of the voice gateway into a single picture and showing even the traffic flow here we see two call processing components one being a publisher one is being a subscriber than both communicating via protocol called SDL you also see two IP phones communicating to the call manager servers via the sccp protocol for either registration or for cost setup or call it tear down between the phones we can see that if a cause place we have an RTP stream that occurs between them or if it if it is an external call it would happen between that phone and the voice gateway router between the voice gave the router and the call processing component we see that a voice control protocol of age to 20 and 3 or mgcp is you use for call routing from the group voice gateway router we see that is connecting into the PSTN using a period line and its voice control protocol for call setup is Q dot 931 and you can see we can have other applications like a voicemail or other sip latest systems connecting directly into the network connecting into the voice or the call processing component via sip or other protocols access codes so access codes are usually a 9 or an 8 it can be any number but this is commonly used for external or interest or calling so for example if I am internally within my company and I want to place a phone call from point A to point B like outside my company I would dial 9 first then the full phone number that's gonna match a route pattern on the call manager system that would know how to route that to the appropriate voice gateway and PSTN network SEP and Cisco with generation 1 into of the cisco call manager product line which is called manager 3 & 4 it had very limited sip support if you had an IP phone with the SIP firmware it required you to have a sip proxy server in place where your sip phones connected to the proxy server and then there was a sip trunk that connected to the call manager server and provided a lot of complexity starting with generation 3 and higher with Cisco Unified Communication Manager five six and seven it provided full and integrative sip support for sip endpoints and for integration with like Microsoft Exchange 2007 for Unified Messaging the one thing about voice and unified communications is providing quality of service proper voice treatment for voice packets voice control and voice data to provide what we call it in - Aniki oh s and these are the main components of providing quality of service for a network that first we classified what data we want to look at voice data video etc then we mark what is the particular priority high and medium or low then we can then we have an optional thing of policing on saying that voice will have this amount of traffic and data to have this amount of traffic this is more of an optional thing queuing and scheduling have very different purposes and provides congestion management and congestion avoidance next we have traffic shaping compression and fragmentation which are elements to QoS across a wide area network this concludes this video overview of discussing voice and unified communications at a high level you can find out more information on configuring some of the voice components voice gateways call manager at raw hub comm size training thank you for watching

Channel: RouteHub

Views: 114,364

Keywords: CallManager, CCDE, CCIE, CCNA, CCNP, CCVP, Cisco, H.323, MGCP, SCCP, SIP, Unity, Voice, VoIP

Id: -dpL6MjgMuM

Length: 9min 11sec (551 seconds)

Published: Mon Jun 15 2009