2- Understanding the Cisco UC

8/16/2019 2- Understanding the Cisco UC

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س ر ك ل ا ا ذ ه ب ح و ي ر ة ع ر ة ج ق د ص “

س ت ح لن م ع ذ هه ُع بِ م يُ ْتََف ْ ِ”

ع ب د ل ل ا ص ة و ت ف ل م ا ك ل أAssociate To Cisco Voice over IP

Prepared & Delivered byMohamed Adel


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What is the Voice!• Traditional Voice

• Understanding the Cisco Unified Communications• Understanding the IP Phone Concepts & Registration

CME : the Smallest System for Cisco IP Telephony• CME Administration , Endpoint & End Users , CME Dial-Plan ,• Configuring CME Voice Ports and Features

Call Manager : the Biggest CISCO IP Telephony Product• Administrator and End-User Interfaces ,• Managing Endpoints and End Users in CUCM ,• Understanding CUCM Dial-Plan ,• Enabling Telephony Features ,• Enabling Mobility Features

Unity Connection and Presence• Voice Mail “answer Machine”• Presence “Chat . Voice Call , Video Calls ” Via Computer

Voice Troubleshooting• Common CME Troubleshooting Issues• Troubleshooting of Call Manager• Monitoring Cisco Unity Connection


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the Pieces of Cisco Unified Communication• Unified = brings together all communication into one

(voice, video and data.)The Cisco UC products break down into 4 core solutions:■ Cisco Unified Communications Manager Express■ Cisco Unified Communications Manager■ Cisco Unity Connection■ Cisco Unified Presence• “core” solutions, So there is many additional applications to expand the features

and functionalities of the system.

Like ( Cisco Contact Center , Cisco Meeting Place , Cisco Webex)


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CUCME ( Call Manager Express)• Cisco Router able to accomplishrouting tables, routing protocols, security with access lists,

Network Address Translation (NAT)

And IP Telephony !

Cisco Router ISR (Integrated Service Router): Could Support IP TelephonyCME can scale to support up to 450 IP Phones• it a good solution for small and even some midsize businesses.• ISR G1 = 18xx , 28xx , 38xx• ISR G2 = 19xx , 29xx , 39xx


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CME Maximum IP Phones

Platform Max Phones

Cisco 2901 35

Cisco 2911 50

Cisco 2921 100

Cisco 2951 150

Cisco 3925 250Cisco 3945 350

Cisco 3925E 400

Cisco 3945E 450

Platform Max Phones

Cisco 1861 12

Cisco 2801 24

Cisco 2811 36

Cisco 2821 48

Cisco 2851 96

Cisco 3825 168

The ISR G1 The ISR G2

Vs


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CME Featuresall-in one device

Call processing and device control: It handles the signaling to the endpoints,call routing, call termination, and call features.■ Command-line or GUI-based configuration: you have the full flexibility ofcommand-line configuration. also use a GUI utility, such as (CCP) or WebBrowser■ Local directory service: The CME router can house a local database of usersyoucan use for authentication in (IPT) network.■ Trunking to other VoIP systems: CME can run as a standalone deploymentinterfacing directly with the PSTN, it can also integrate with other VoIP

deployments.■ Direct integration with Cisco Unity Express (CUE): CUE, which runs through amodule installed in a Cisco router, can provide voicemail services to the IPPhones supported by CME.


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CME Call Flow IP Phone to IP Phone

After CME establishes the RTP stream between the IP phones, it can crash,reboot, or catch fire, and the conversation between the two endpointsAll the phone features (such as hold, transfer, conference, and so on) are

still managed By CME Using SCCP or SIP Protocol


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CME Call Flow for Calls to the PSTN

CME router is attached to the PSTN using a digital ( T1/E1 ) or analog ( FXO) trunk. Oncethe audio for the call connects, the CME router assumes the role of convertingbetween VoIP audio and PSTN audio.the CME router is equipped with Digital Signal Processors ( DSP), which are simplyadditional “mini processors” dedicated to voice functions.


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CME & CUE

NM-CUEAIM-CUEVoicemail: The core feature provided by CUE .

Auto-attendant: Thank you for Calling MAC For Learning Technology!

Interactive voice response (IVR) system : CUE includes basic IVR capabilitiesthat allow callers to move through a menu system

Native T.37 fax processing : CUE can then distribute the fax to a user’s mailbox.

Standards-based: All signaling between the CME router and CUE module


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CUCM (Call Manager)When Cisco first released Call Manager 2.4 , it ran as an application on theMicrosoft Windows NT 4.0 OS supported by the Internet Information Server ( IIS)web server.

Cisco Moves from CUCM 2.4 till 4.3 with Windows but 4.3 was working withWindows server 2003

Cisco Produce CUCM on Linux (Red Hat) starting by version 6.x till now which 10.5You should install cisco Call Manager on Certified Hardware which is MCS for oldversions

And now UCS servers Over ESXI(VMware ) so now we can install more than Virtualserver on the same hardware

To know more About CUCM you should go with CIPT1 and CIPT2 course


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CUCM Features• Full support for audio and video telephony: CUCM supports audio and video calls for

midsize to enterprise class• Appliance-based operation: Modern CUCM versions run as an appliance, which means

the underlying operating system is secured and inaccessible.• Redundant server cluster: As the saying goes, “One is none, two is one.” CUCM supports

redundant servers configured in a cluster relationship.CUCM clusters can scale to 30,000 IP phones ( SCCPor SIP in unsecure mode)

or 27,000 IP phones ( SCCPor SIP in secure mode ).

• Intercluster and voice gateway control and communication: Even though a CUCM clusterhas a limit of 30,000 IP phones, you can create as many clusters as you like (with up to30,000 IP phones each) and connect them together using intercluster trunk connections.

• Also make outside Calls using Gateways to PSTN• Built-in Disaster Recovery System (DRS): As a built-in feature, the CUCM DRS service

allows you to back up the CUCM database

• Directory service support or integration: By Local Users created on CUCM or byIntegrating with Active Directory


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CUCM Database ReplicationCUCM Database Relationship: The CUCM IBM Informix database includes all the“static” data of the cluster (directory numbers, route plan, calling permissions, andso on). This data replicates to all the servers in the cluster.

CUCM Runtime Data: Just like the name sounds, the runtime data encompassesanything that happens in “real time” in the CUCM cluster.

such as a phone registering, a call initiation, a call disconnect, Call Hold , CallTransfer

Each CUCM cluster supports a single Publisher and up to eight Subscribers.


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• Subscribers : These servers are providing dial tone,receiving digits, routing calls, andstreaming music on hold. However,

• Publisher typically performs only two primary functions: It maintains the database andserves TFTP requests.

• The Publisher serves such a critical role in maintaining the only writable copy of the CUCMdatabase

• Tip: In smaller environments (500 IP phones or less), it’s perfectly fine to use thePublisher for call processing and database management.

• Once you have more than 500 IP Phones best practice to pull the Publisher out of callprocessing and leavethat work to the Subscribers.

• once you exceed 1,250 users, Cisco recommends moving the TFTP server role to a dedicatedserver.

• If the Publisher fails, the CUCM cluster goes into a type of “locked configuration” mode. Youcan no longer make changes to the database, no longer make changes to the database (suchas adding a new IP phone, changing the route plan, modifying a music on hold selection, andso on)

• The only exception to this is the user-facing features. These include functions such asforwarding

your phone, enabling the message waiting light, pressing the Do Not Disturb button, andmany others. The CUCM Subscribers are able to write these changes to their local database,replicate them to the other Subscribers in the cluster


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Cisco Unity Connection• Just as the original Cisco Call Manager software, the original Cisco Unity

ran on a Microsoft Windows OS and used the Microsoft Exchange e-mailserver solution as a message store for voicemail.

• Now Unity Connection Based on Linux OS


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Cisco Unity Connection Features• Proven appliance-based platform: Cisco Unity Connection is built on top of

the same stable, Secured, appliance-based operating system as CUCM. (These

two software products even use the same installation DVD.)• Up to 20,000 mailboxes per server : Unity Connection supports a single-server

configuration, most organizations will opt for a high availability pair of servers.• Access voicemails from any where: CUC allows voicemail retrieval from

phone, e-mail, web browser, mobile devices, and instant-messengerplatforms.

• LDAP directory server integration: Similar to CUCM, Cisco Unity Connectioncan integrate with an existing corporate directory (such as Microsoft ActiveDirectory) to avoid creating a duplicate user database.

• Active/active high availability: CUC uses a Publisher/Subscriber IBM Informixdatabase scheme just like CUCM between a pair of servers. The pair of serverscan support up to 20,000 mailboxes in a redundant fashion. Both servers canaccept client requests (giving it the active/active redundancy). Typically, thelargest Cisco Unity Connection server can support up to 250 voicemail ports(essentially allowing 250 people to check their voicemail at a time). Bycreating a high availability pair, you can now support 500 voicemail ports.


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• Note: If one of the servers in a Unity Connection high-availability pair fails, all20,000 mailboxes are still available, but the number of voicemail ports is reducedto the maximum supported by the single server. Which will be 250 Ports

CUCM and Cisco Unity Connection Communication

1- incoming call from the PSTN arrives at the voice router.2- CUCM receives the call and directs it to the appropriate IP phone ,If someone does

not answer the IP phone or diverts the call to voicemail

3- CUCM transfers the call to the Unity Connection server. The extension of the

originally called phone is contained in the signaling messages ,which allows UnityConnection to send the call to the correct voicemail box.

4-After the caller leaves a message on the voicemail server, Cisco Unity Connectionthen “makes a call” (via SCCP or SIP) back to a Message Waiting Indicator (MWI)extension on the CUCM server.

5- CUCM then lights the voicemail indicator on the Cisco IP Phone, alerting the userthat they have a voiceAll this interaction between CUCM and CUC is done using voicemail ports message waiting.


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Cisco Unified Presence• Instant Messenger (IM) clients to communicate• you are able to see the status of a user, gauging whether they are

available, busy, or offline before you begin to chat with them.• allowing you to see the status of a user (are they on the phone,

off the phone, not available)

Presence adds the following capabilities to your voice networkEnterprise instant messaging: the Jabber Extensible Communication

Platform ( XCP), which is an industry standard method of communicatingbetween different IM clients.Message compliance: Cisco Presence supports logging functionality for alltypes of IM communicationInterdomain federation: you can connect your organization to otherdomains, such as Google Talk or WebEx ConnectJabber XCP extensibility: XCP can allow features such as peer-topeerfile sharing, application sharing, video-conference systemsSecure messaging: Applications integrating into Unified Presence can useIPSec or TLS standards to encrypt and secure all communication.

Documents

2- Understanding the Cisco UC