Skype for Business Trivia Test your Skype for

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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 § The internet § MPLS cloud § Cheap(er) § Qo. S option § Send and forget § Traffic classes § No control § (More) expensive § Gradual to full control

Network conditions Optimal Acceptable Poor Inter arrival packet jitter (average) ≤ 5 ms ≤ 10 ms > 10 ms Inter arrival packet jitter (maximum) ≤ 40 ms ≤ 80 ms > 80 ms Packet loss rate (average) ≤ 1. 0% ≤ 5. 0% > 5. 0% Network latency one-way < 100 ms ≤ 100 ms > 100 ms

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

Prepare Educate Implement Verify

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

Microsoft Confidential Implement - Network Qo. S 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 Do. S 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 26 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 Qo. S - Diff. Serv § § Media Type Per Hop Behavior Queuing and Dropping Notes: Priority Queue Low loss, low latency, low jitter, assured bandwidth Pair with WAN Bandwidth Policies on constrained links Audio EF Video AF 41 BW Queue + DSCP WRED Class 4. Low drop priority. Pair with WAN Bandwidth Policies on constrained links SIP Signaling CS 3 BW Queue Class 3. Bandwidth allocation should be sufficient to avoid drops App Sharing AF 21 BW Queue + DSCP WRED Class 2. Low drop priority. Pair with End User Policy Caps File Transfer AF 11 BW Queue + DSCP WRED Class 1. Low drop priority. Pair with End User Policy Caps

MS_Endpoint GW_Endpoint All. Streams Poor. Streams. Ratio ORLYMED 0104 DELYGW 01. contoso. com 142 49 35% UKLYMED 0108 UKLYGW 01. contoso. com 140 42 30% SILYMED 0110 UKLYGW 01. contoso. com 136 34 25% DELYMED 0111 UKLYGW 01. contoso. com 206 51 25% ORLYMED 0103 DELYGW 01. contoso. com 618 136 22% CALYMED 0301 JPLYGW 01. contoso. com 4, 279 880 21% DKLYMED 0112 JPLYGW 01. contoso. com 1, 431 275 19% ORLYMED 0102 JPLYGW 01. contoso. com 2, 514 473 19% UKLYMED 0109 UKLYGW 01. contoso. com 236 44 19% CALYMED 0301 JPLYGW 01. contoso. com 2, 519 463 18% CALYMED 0107 UKLYGW 01. contoso. com 622 109 18% ORLYMED 0105 JPLYGW 01. contoso. com 4, 339 605 14%

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

Proactively automate the diagnostics and troubleshooting of bad calls Reduce the cost of deploying Qo. S and implementing traffic engineering IT agility and network customization through real-time, policy-based configuration of network resources

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.

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