Remote Workers Without the Hassle
Jeff Johnson – Avaya
Dwight Reifsnyder - NACR
Session 446
VPN aka The Old Way
VPN
• Companies are moving away from VPN– Don’t want the extra servers– Connect to email and IM without using a VPN
so they want to do voice without VPN as well
• Frequently changing passwords– Most companies require that the user password
expire between 30 and 90 days so the user must change their VPN password on the hard phone as well
VPN vs. QOS
• Lower voice quality– RTP flows pass through
additional servers where bandwidth and latency issues are more likely to appear
– VPN overhead increases bandwidth requirements
What is Remote Worker
Remote Worker Locations
• Works from home every day• Works from home occasionally• Works from home in an emergency• Works while at a customer• Works while roving• Works at a remote office
Remote Worker Roles
• Office Worker• Roving Worker• Agent (not covered in this presentation)
Remote Worker Devices
• Hard Phone• Avaya Communicator
– Soft Phone on work PC– Soft Phone on personal PC– Smart Phone– Tablet (iPad)
Remote Worker Use Cases
Remote Worker at Home Every Day
• SIP Hard Phone and Smart Phone• Work from home and on a conference call
– but Barkley needs his walk now• Pick up call on smart phone VOIP mode• Seamless transition
– WiFi to Cellular data– And then back again
Remote Worker at Home Occasionally
• Softphone on work laptop with no VPN– Email and IM connect externally
• Sit on back deck, enjoy the view, and still get all of your work done
Remote Worker at Home in an Emergency
• Softphone on personal PC computer
• Some days you have to work from home when it is unexpected
Remote Worker While at a Customer
• iPad tablet• At a customer, but they
are running late and you have to sit in a conference room and wait, so you make a few calls from your tablet
Remote Worker While Roving
• Smart phone• While walking the city
streets you can send and receive phone calls
Remote Worker at a Remote Office
• Smart phone as back up device
• Instead of a gateway use the smart phone and cellular data as a backup strategy
SIP, AST, and PPM
Background – What is SIP
• Internet Engineering Task Force (IETF) RFC 3261
• SIP supports five facets of multimedia communications– User location– User Availability– User capabilities– Session setup– Session management
What Does SIP Do?
• Sessions (Audio, Video, IM, etc.)– Call Control– Media
http://blogs.technet.com/b/isablog/archive/2009/10/21/forefront-tmg-is-sip-aware.aspx
SIP Telephony Features (SIP 19)Endpoint-
based
feature
s
•Call Hold•Consultation Hold•Music on Hold•Transfer (Attended, Unattended, Instant Messaging)•Conference (3rd party added, 3rd party joins)•Click to Dial•Automatic Redial•Call Park
Server-based
feature
s
•Call Management (Incoming and Outgoing)•Find Me•Call Forwarding (Unconditional, Busy, No Answer)•Call Pickup•Message Waiting Indication (MWI) – RFC 3842
Standard Based vs. Proprietary
• How do you add proprietaryfeatures to a standard?
• Microsoft –– Embrace– Extend– Extinguish
Adding Features to SIP
• AST – Advanced SIP Telephony
• Full Compliance
• Subscribe, Notify, Publish
AST Phones Provide More
• Personalization through HTTP and XML– Features– Favorites– Customization
SIP 19 Registration
• 4 messages (registration / authentication)
AST Phone Registration
AST Phone Configuration
• PPM via HTTP using XML and SOAP
Multi Device Access and Dual Registration
Multi Device Access
• SIP Phones only• 1 to 10 simultaneous
devices• 2 or 3 is most common• Uses registration
capacity in Session Manager
Multi Device Access
• Simultaneous device threshold handling– Drop oldest connection (recommended)– Not allow new connections until other
connections have dropped
Dual Registration
• H.323 with SIP Phones• 1 H.323 device
– Desk phone matches other hard phones for firmware management
• 1 to 10 SIP devices– For additional devices
Split DNS
• Use FQDN on the phone application• Internally resolves to Session Manager• Externally resolves to Session Border
Controller
Remote Worker Architecture
What You Don’t Need
• Dedicated voice circuit ( “SIP trunk”)• SIP Trunking carrier
Plain Old Telephone Service
TCP
Sample Production Architecture
• Avaya SBCE w/ RW Licensing• Internet Connectivity• Public IP Address (or two for HTTPS)• SIP Clients• Programming and Configuration• 3rd Party Security Certificates
SBCE: Remote Worker Overview
Remote Worker are external to the Enterprise firewall Avaya Session Border Controller for Enterprise
− Authenticate SIP-based users/clients to the enterprise
− Securely proxy registrations and client device provisioning
− Securely manage communications without requiring a VPN
Firew
all
InternetEnterprise
Avaya SBCE
DMZ
Firew
all
Remote Workers
Carrier
SIP Endpoints
3rd Party SIP(Call Manager, Fax, etc)
SBC – Trunking
Experience PortalMessaging
Communication Manager
H.323 Endpoints
Components, Signaling, Media
SBCE – RW
Session Manager
Carrier
SSignaling Path SMedia Path
SIP Endpoints
3rd Party SIP(Call Manager, Fax, etc)
SBC – Trunking
Experience PortalMessaging
Communication Manager
H.323 Endpoints
Internet
Budget POC
• Virtual SBCE w/ 30 day trial license• Internet Connectivity• Public IP Address (or two for HTTPS)• SIP Clients• Programming and Configuration• Avaya Demo Security Certificates
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Session 446
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