UCC ON ARUBA WIFI

#ATM15ANZ | @ArubaANZ

UCC ON ARUBA WI-FI

CONFIDENTIAL © Copyright 2015. Aruba, a Hewlett Packard Enterprise company. All rights reserved. 2 #ATM15ANZ | @ArubaANZ

Agenda

•  Trends •  UCC Challenges •  UC over Aruba WLAN –  ALG, Lync, Wi-Fi Calling, Jabber

@ArubaNetworks

3 #ATM15ANZ | @ ArubaANZ CONFIDENTIAL © Copyright 2015. Aruba, a Hewlett Packard Enterprise company. All rights reserved.

Transition Content

Current Trends

•  Voice as a “standalone application” is going away

•  SIP, SCCP, SVP, H323, Vocera, NoE

•  UCC is the “new wave” in IT •  Skype, Lync, FaceTime, Jabber, Hangouts etc. •  Next “BYOD” problem

@ArubaNetworks


Why Microsoft Lync?

•  Integration with AD, Outlook, Office etc. •  Unified mobile client for BYOD •  Support for voice, video, desktop sharing, file sharing etc. •  On-premise and Cloud based deployment models •  Strategic partner and customer of Aruba

Challenges with UC over Wireless

@ArubaNetworks


Challenges with UC over Wireless

•  Diversity of Clients

•  AV

•  App incompatibility

@ArubaNetworks

•  AP placement

•  Channel Capacity

•  AP Capacity

•  Tx/Rx Characteristics

•  Interference

•  Mobility

•  QoS on wireless

•  QoS on wire

•  Queue overflows/drops

•  Routing/path changes

•  WAN

•  UC server monitoring


Essentials to support Voice over Wi-Fi

•  Classification & prioritization of Voice •  Wi-Fi optimized for Voice •  Real time and pro-active visibility

•  Analytics

Lync

@ArubaNetworks


Types of Lync Deployments

•  Lync On-Prem •  Lync server farm is hosted on premise

•  Hosted Lync •  Lync server farm is hosted on a private cloud

•  Lync Online •  Lync server farm is hosted by Microsoft


Lync On-Prem/Hosted Lync

Exchange Server

QoE Server/ Monitoring

Active Directory

Lync Federated Partners

Reverse Proxy

Lync Edge Server Lync FE Server Pool/ Lync SDN API Dialog Listener

Lync SDN Manager

Internet

Wi-Fi Mobility Controller

•  Benefits from all Lync Server functionalities

•  Maximum flexibility

•  Interoperate with other on-premise investments

•  Works with Exchange and SharePoint


Transition Content

Lync Online

@ArubaNetworks

•  Uptime Assurance •  Using corporate

directory •  Reduced administration


Transition Content

UC/Lync Call Type/Flow

@ArubaNetworks

Call Type Signaling Traffic Media Traffic

Peer-to-Peer Session

Lync server pool

UC endpoint <-> UC endpoint

Conference Session UC endpoint <-> Lync server pool

PSTN/Mediation session UC endpoint -> (Mediation server)* -> PSTN gateway/IP

PBX

Content Sharing UC endpoint <-> UC endpoint/Lync server pool


Lync Network Bandwidth Requirements

Modality Description Max BW Typical BW

IM, Presence and signaling

Nonmedia elements 2 Kbps 1.6 Kbps

Voice RT Audio Wideband 62 Kbps

39 Kbps

Conference voice G722 100.6 Kbps

46.1 Kbps

Video - small H264 at 320x180 250 Kbps

200 Kbps

Video - medium H264 at 640x480 800 Kbps

640 Kbps

Video - high H264 at 1280x1080 4 Mbps 3.2 Mbps

UC/Voice Aware WLAN

@ArubaNetworks


ALGs

•  SIP •  SCCP •  Vocera •  H323 •  NoE


Lync Classification using Heuristics

•  Leverages DPI to identify & prioritize real time voice and video traffic

•  Ideal for Lync online deployments •  On-Prem deployments without SDN API can

leverage heuristics

•  AirWave aggregates network wide data for visibility

Lync


Lync Classification using SDN API

•  Lync server integrates with mobility controller using SDN API

•  Real time call info is shared with mobility controller

•  Controller leverages the info to apply QoS

•  Ideal for On-Prem Lync deployments

•  AirWave aggregates network wide data for visibility

Lync


Call Details via SDN API

Lync

•  CALL START •  Caller/callee, device, session, BW, time etc.

•  PERIODIC INTERVALS •  Instantaneous Call quality

•  CALL END •  Avg. call quality, time etc.


Wi-Fi Calling Detection

•  Sequence of events •  Gateway Learning Phase •  IPSEC Tunnel

Establishment •  Media flow and Call

Classification

•  Future AOS will support automatic detection, classification for Wi-Fi calling

Carrier Core Network

IMS (SIP) RTP

ePDG (IPSEC)

P-GW (IP)

Authenticate

DNS discovers ePDG IP address

IKEv2 establishes keys for IPSec tunnel from SIM & AAA

SIP stack on handset registers with SIP server (IMS)

Call setup, RTP media session, call teardown

Inside IPSec tunnel


Jabber Aware Aruba WLAN

•  Existing SIP ALG has been enhanced to support Jabber calls –  Special characteristics of Jabber calls

tracked to provide visibility

•  Ability to identify Voice, Video and Desktop Sharing

•  Ability to apply QoS respectively

•  Future AOS will support automatic detection, classification for Wi-Fi calling Jabber caller Jabber Callee

Signaling

Media


QoS on Aruba WLAN - Downstream

Internet

Wi-Fi access point

Corporate

firewall & NAT

Wi-Fi mobility controller

LAN

Operator core

Wi-Fi

5. Handset receives frame

4. AP transfers voice priority to WMM ‘voice’ priority, queues and transmits with priority.

3. LAN must be QoS-aware for L2 L3 QoS tags.

2. Firewall rules in mobility controller identify Wi-Fi calling traffic, tag packets with ‘voice’ priority on outside of GRE/IPSec tunnel to AP.

1. It must be assumed that packets received from the Internet are not priority-tagged.

Downstream QoS chain for Aruba networks carrying Wi-Fi Calling

Wireless LAN Edge LAN Core


QoS on Aruba WLAN - Upstream

Internet

Wi-Fi access point

Corporate

firewall & NAT

Wi-Fi mobility controller

LAN

Operator core

Wi-Fi

1. Handset transmits voice frames @ WMM priority 3 (VOI)

2. AP transfers voice priority to outer envelope of GRE/IPSec tunnel to controller (firewall rule can over-write original tag).

3. LAN must be QoS-aware for L2 L3 QoS tags.

4. Mobility controller maintains priority as it unpacks the voice packet.

5. QoS awareness should be supported as far as possible, especially on low-bandwidth access links.

Upstream QoS chain for Aruba networks carrying Wi-Fi Calling

Wireless LAN Edge LAN Core


Voice: handover challenges

Between WLAN and LTE §  Inter-network handover §  Entering/leaving the bldg

Within the WLAN §  Inter-AP handover §  Requires fast handover

with good quality

Wi-Fi Wi-Fi Wi-Fi

Wi-Fi LTE

How to tell the difference?


802.11k, v, r

•  Many features, most important are: 802.11k §  Neighbor report from AP to client

§  Channel report from AP to client §  Beacon report from client to AP

802.11v BSS Transition Management from AP to client 802.11r Fast Transition by client

All rolled up in 802.11-2012 in 2015


802.11k, v, r features

B

C D

E

Neighbor report

AP chan secy key beacon scope offset B 6 WPA2 0 45 D 52 WPA2 0 12 E 161 WPA2 0 74

Information about other APs to help with handover candidate discovery

C

Beacon report Client reports how it hears (RSSI) the beacons of other APs

BSSID RSSI AP B -65 AP D -72 AP E -65

C

BSS Transition Management AP instructs client to move to another AP

Move to AP D…

E D B

D

C

Channel report AP informs client of channels used by the WLAN

Channel 6 52 161

Overlaps with neighbor report


Client Match Client Match forms a virtual Beacon Report:

1.  APs measure RSSI from client

2.  APs receive beacon reports from the client

3.  Estimate the ‘best’ AP

4.  If client is _far_ from ‘best’ AP…

5.  Redirect (force handover) to ‘best’ AP

B

C D

E

A

track

-50 -60 -70 -80

A B E

Signal strength

distance


802.11r fast BSS transition

C D

R0 key

C

802.1X authenticator

R0 key

S0 key S1 key PTK

Initial Authentication establishes level 0 key

WLAN distributes level 1 keys

R1 key C D

On reassociation, client presents level 1 key to new AP

R1 key PTK

S0 key S1 key PTK

Mobility domain: A group of APs covered by a level 0 keyholder

Over-the-air reassociation widely adopted, over-the-DS reassociation (via the current AP) not used

Level 0 key (derived at initial authentication, never exposed OTA) Level 1 key (per-AP keys) used to derive… Pairwise temporal keys (to encrypt communication)

PTK R1 key

Differences between FT and OKC? … Not much

keyscope keyscope


Devices incorporating 802.11k, v, r features

•  Early indications of support for key 802.11 features

•  Ahead of Wi-Fi Alliance certifications, so beware of inconsistent behavior

Device OS 11r 11k 11v iPhone6, 5s, 5c, iPad2+ >= iOS8 Y Y Y iPhones <= iOS7 Y Y N Samsung Galaxy S5 Android 4.4 Y N Y PC / Intel 7260 <= Windows 8.1 N N N Surface Pro Windows N N N MacBook <= OS-X 10.9 N N N

Note: “11k” = Neighbor report “11v” = BSS Transition


Wi-Fi Calling: network edge indication mechanisms

Multiple Edges

Bldg 1

Bldg 2

Bldg 3

Within the WLAN §  de-auth frame (ambiguous) §  802.11v BSS transition management

(defined in standards, implemented in recent handsets

Between the WLAN and LTE §  de-auth frame (ambiguous) §  Special 802.11v (BSS transition

management) frame (defined in standards, not implemented in handsets)

No way for the handset to determine type of transition autonomously


Call Quality Analysis

•  UCC Score •  Calculated by analyzing the RTCP/RTP information for

related media flows over the wireless link •  Delay, jitter and packet loss is also calculated •  Computation performed for voice calls only

Lync on Aruba Architecture

@ArubaNetworks


Lync SDN API for a Centralized Campus

Lync

SDN API

East Campus West Campus


Lync SDN API for a Distributed Campus

America EMEA APJ

Lync Lync Lync

Lync Cluster Lync Cluster Lync Cluster


Lync SDN API for a Branch

Lync

Store 1 Store 2 Store 3

UC Visualization on AirWave

@ArubaNetworks


UC Visualization

•  UCC Dashboard •  CDR •  Visual RF Integration •  Per-User Call Visibility •  End-to-End View •  Pro-active Alerting •  Reporting


UCC Dashboard


Call Detail Records(CDR)


Per-User Call Records – Example 1


Pro-active Alerts


UCC Calls on Visual RF

THANK YOU

#ATM15ANZ | @ArubaANZ

THANK YOU

UCC ON ARUBA WIFI

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