Voice over Internet Protocol

Voice over Internet Protocol
Space Telescope Science Institute
• What is VoIP?
• What will be VoIP services will be offered at STScI?
– Basic VoIP Features (see user and administrative features
and benefits)
– Voicemail
– Soft Phone (Cisco Jabber for Macs and Windows laptops)
and Mobility ( iPhones, iPads, Androids and BlackBerrys)
• Scalability of STScI VoIP infrastructure
What is Voice over Internet Protocol
Digital Signal
Digital Signal
Cisco Call Manager
Cisco VoIP features
Summary of user features for Cisco VoIP
Call connection
Impromptu audio conference (up to 6
internal participants)
Caller ID (at this time only for Internal calls)
Hands free, full duplex Speaker phone
Headset (uses RJ11 type connector)
Message Waiting Indicator (MWI)
Summary of user features for Cisco VoIP
 Dialed number display
 Intercom
 Use of reground and recyclable products in
manufacturing handsets (Cisco phone only)
 Supported encryption for voice traffic,
 Call forwarding to either another local number
or external number
 Self service website to allow user to configure
their desktop phone remotely.
Summary of user features for Cisco VoIP
 Call Park and pickup
 Direct Inward dialing and Direct Outward
 Directory dial from phone: Corporate directory
(AD) and personal directory (contacts address
 Mute capability
 On-hook dialing
 Multiple speed dials
 Pre-record messages
Summary of features managing your Voice communications
Desktop voice communication can be managed using a
WEB browser.
Customize Do Not Disturb options
Set call forwarding per line
Change the Voice Message Indicator setting per line
Change the Audible Voice Message Indicator setting per
Change ring setting per line
Set speed dial buttons on your desktop phone
Change your PIN
Add a New Remote destination
Summary of user features for Cisco voicemail
You can select conversation type; full or brief prompts are supported.
You can change prompt and message playback speed.
You can address and then record a message, or record and then address a message.
You can record up to five personal greetings (alternate, busy, internal, off-hours, or
You can specify the order in which messages are presented over the phone, by
message type (voice, fax, or email), urgency, or LIFO/FIFO.
You can set an expiration date for any personal greeting.
You can manage an alternate greeting, require callers to listen to the full greeting, or
notify users when a greeting is on.
With a cascade message-notification feature, you can send additional notification
types if a message is not retrieved.
You can select whether or not message counts are announced; options include type,
totals, saved, and new counts.
You can specify Call Forward to a personal greeting or busy greeting.
You can provide message notification for new messages through devices such as
Simple Mail Transfer Protocol (SMTP) text, pagers, and phone destinations.
You can use your desktop telephone to manage, listen or record messages
Summary of features using Cisco’s Jabber application
Use a single, intuitive interface for instant messaging with individuals and
groups, IP telephony, visual voicemail, voice and web conferencing,
desktop sharing1, communication history, and integrated directories.
Presence (if you are online or Do Not Disturb)
View real-time availability of co-workers and colleagues within and
outside the enterprise network.
Exchange and display presence availability information and instant
messages with other Cisco Jabber users, Cisco Unified Personal
Communicator, Cisco WebEx Connect®, Microsoft Office Communicator
and Lync, IBM Lotus Sametime, AOL, GoogleTalk, and many other
XMPP-compatible clients.
Exchange presence information with mobile handsets using Cisco Jabber
or third-party XMPP-compatible clients.
Display customized availability messages.
Your status is updated automatically when you are in a Cisco WebEx
meeting or sharing an application.
What does the user interface for Cisco Jabber look like
Scalability of STScI VoIP Infrastructure
 Call manager server pair will support up to 10,000 subscribers.
 Unity server (voicemail) can support up to 15000 users and a
maximum of 250,000 users per clusters.
 Maximum number of subscribers for Cisco Call Manager cluster
can support up to 30,000 users.
 Cisco IP Telephony solution can support multiple Call Manager
 Adding services is accomplished by adding more application
servers for example if we wanted to provision Cisco Mobile
Communicator as a service. We would add the application server
to our voice network. Below is the features of Cisco mobility.
 Cisco has delivered Unified Communications in modular
architecture, as services are needed the can be added to the
overall Unified Communication architecture.
 In the future we may use external Session Initiation Protocol (SIP)
trunks instead of connecting to the public telephone network. This
will help reduce our cost for external call and long distance calls.
Impact to the network with the deployment of VoIP
Cisco Unified IP
Presence server
(used for Cisco
STScI internal
STScI VPN server
Cisco Unity server
Cisco Call Manager
Cisco Voice Gateway
Public Telephone
STScI VoIP Deployment model
Single site deployment
More information about Cisco’s IP Telephony can be found at –
More information about the International Telecommunications Union (ITU) and voice
standards can be found at –

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