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Jitter The amount of time the packets are delayed before processing to compensate for packets arriving later than other packets Gets added to the network latency Packet loss The amount of packages that never survived the trip from A to B, got malformed, or simply arrived outside of the jitter buffer Displayed in percentages Latency Time it takes the packet to get from A to B When talking about networks this is usually round trip time and noted as network latency

Managed versus unmanaged

Network conditionsOptimalAcceptablePoor Inter arrival packet jitter (average)≤ 5ms≤ 10ms> 10ms Inter arrival packet jitter (maximum)≤ 40ms≤ 80ms> 80ms Packet loss rate (average)≤ 1.0%≤ 5.0%> 5.0% Network latency one-way< 100ms≤ 100ms> 100ms

Network conditionsGood Inter arrival packet jitter (average)≤ 5ms Inter arrival packet jitter (maximum) ≤ 40ms Packet loss rate (average)0% approaching Network latency one way ≤ 100ms (should include checks on delay versus geographic distance)

PrepareImplementVerifyEducate

Implement - QoS Visualized Audio Video Audio Traffic Video Traffic Signalling App Sharing Total Available Bandwidth File Transfer Other Lync Traffic DSCP 46 - Queue DSCP 34 - Queue Unmarked- Queue

26 Microsoft Confidential Implement - Network QoS Strategies DSCP GPO to mark traffic from OCS / Lync Trust DSCP marking from distribution layer Must overcome 3 rd Party applications re-marking their traffic with DSCP Must overcome rogue machines connecting to network and using priority queue overloading for DoS attack Port Based Re-Mark based on port at WAN Ingress point Restrict Media to 40 UDP ports Limited risk of network equipment upgrades Possible issue if 3 rd party application randomly chooses the defined port range, and is prioritized DSCP + Port Mark DSCP using policies Restrict port range by GPO Check DSCP and Port are correct. A 3 rd Party application randomly using the specific port range won’t be marking with DSCP A 3 rd party marking DSCP won’t be using our Port range Protocol Based Re-mark based on protocol (SRTP) at WAN Ingress Requires Network Equipment to support deep packet inspection at Line Speed. IP Based Re-Mark based on SRC or DST IP addresses Works for Centralized PSTN and Conferencing traffic (GNOC) Doesn’t work for Peer traffic scenarios

Implement - Network QoS - DiffServ Media TypePer Hop BehaviorQueuing and DroppingNotes: AudioEFPriority QueueLow loss, low latency, low jitter, assured bandwidth Pair with WAN Bandwidth Policies on constrained links VideoAF41BW Queue + DSCP WREDClass 4. Low drop priority. Pair with WAN Bandwidth Policies on constrained links SIP SignalingCS3BW QueueClass 3. Bandwidth allocation should be sufficient to avoid drops App SharingAF21BW Queue + DSCP WREDClass 2. Low drop priority. Pair with End User Policy Caps File TransferAF11BW Queue + DSCP WREDClass 1. Low drop priority. Pair with End User Policy Caps

MS_EndpointGW_EndpointAllStreamsPoorStreamsPoorStreamsRatio ORLYMED0104DELYGW01.contoso.com % UKLYMED0108UKLYGW01.contoso.com % SILYMED0110UKLYGW01.contoso.com % DELYMED0111UKLYGW01.contoso.com % ORLYMED0103DELYGW01.contoso.com % CALYMED0301JPLYGW01.contoso.com4, % DKLYMED0112JPLYGW01.contoso.com1, % ORLYMED0102JPLYGW01.contoso.com2, % UKLYMED0109UKLYGW01.contoso.com % CALYMED0301JPLYGW01.contoso.com2, % CALYMED0107UKLYGW01.contoso.com % ORLYMED0105JPLYGW01.contoso.com4, %

Network Control & Management Functions Network Elements End-User Application Focused NB APIs Network Services Function Network Focused NB APIs End-User Application SB APIs (Openflow)

Offer uninterrupted Lync on mobile devices. Comprehensive view of Lync sessions, trends, and server infrastructure Gain in-depth visibility into application and network response times. Dynamically automate policy deployment. Gain unique real-time insight into issues that impact Lync performance.