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Lync 2010 client does not login in Lync 2013 server

ISSUE:   Lync 2010 client does not login in Lync 2013 server. CAUSE:   The cause may be following one from 3. i.   Client version filter in Lync SERVER ii.  Network Security: Minimum session security in Lync SERVER SOLUTION: i.   Client version filter in Lync SERVER :  Here ii.  Network Security: Minimum session security in Lync SERVER :  Here
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Set NTLM authentication as first choice in lync 2010/2013 server

ISSUE: How to set authentication support NTLM in lync 2010/2013 server as first choice ? SOLUTION: Step 1. Run secpol.msc on Lync Front End server Step 2. Select Local Policies  -> Security Options Step 3. Open Network Security: Minimum session security for NTLM SSP based (including secure RPC) Step 4. Tick on Require NTLMv2 session security (default Require 128-bit encryption) Step 5.  Open second Network Security: Minimum session security for NTLM SSP based (including secure RPC) Step 6. Tick on Require NTLMv2 session security (default Require 128-bit encryption) You are done!
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How to enable HD video in Microsoft Lync

ISSUE:   You can change video resolution on lync client by increasing/decreasing the capture window size. The video resolution change can be either of these following type --       1. QCIF (176×144) 15fps       2. CIF (352×288) 15fps       3. VGA (640×480) 15fps       4. HD (1280×720) 13fps  The default video resolution set on lync server normally is VGA . 1. How to know about it? The answer is here . 2. How to change video resolution it? Open lync server management shell in administrator mode. Now give following command --- Set-CsMediaConfiguration –Identity Global -MaxVideoRateAllowed Hd720p15M The underline attribute can be either Hd720p15M, VGA600K, and CIF250K. 3. How to make sure that configuration is applied? The answer in here .
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How to know about current maximum video resolution supported by lync server

There are 2 possible way to know about video resolution configuration. 1. The hard way -- from lync server management shell. Open lync server management shell in administrator mode. Now give following command --- Get-CsMediaConfiguration –Identity Global Output:   2. Easy way -- smart way from lync client uccapi log with out lync server. Open uccapi log of lync client from Tracing folder . Now search by <ucMaxVideoRateAllowed> .You will see that like --- <ucMaxFileTransferPort>5389</ucMaxFileTransferPort> <ucPC2PCAVEncryption>SupportEncryption</ucPC2PCAVEncryption> <ucMaxVideoRateAllowed> Hd720p-1.5M </ucMaxVideoRateAllowed> <qosEnabled>true</qosEnabled> <ucDiffServVoice>40</ucDiffServVoice> <ucVoice802_1p>0</ucVoice802_1p> Which is your current video resolution configuration. To change it please follow the procedure describe on here.
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DTMF or Telephony event support on SDP and in RTP in Microsoft lync audio conference

DTMF (Dual Tone Multi Frequency) is a type of signaling used primarily in voice telephony systems. It features audible tones in the frequency range of the human voice which are typically used when dialing a call (on analog lines) or when operating an IVR menu. There are many other applications for this signaling. For more information, see the wikipedia article on DTMF ( http://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling ) DTMF RTP: A dtmf packet is 16 bytes. DTMF data = 12 bytes (RTP header) + 4 bytes (RTP payload) 4 bytes (RTP payload) has mapping of key press value as event. After parsing this 4 bytes the receiver end can get instruction or event what to do. DTMF SDP:              dtmf payload is 101 . It is passed on audio level of lync SDP. m=audio 5476 RTP/AVP 101 . . . a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16  a=fmtp:101 0-16  indicates the key value that is supported...
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How to export sip and a/v certificate from lync server and edge server in lync 2010/2013.

To enable a lync user 3 certificates are necessary. These certificates are exported from lync server, edge server and directory control. Certificate for specific services: 0. Root CA 1. SIP services/Lync Front-end. 2. AV services/Edge . 1. SIP services. : STEP 1.   Goto run in windows button in lower left corner and type mmc . STEP 2.   In mmc window selecte File-->Add/Remove snap-in. STEP 3.   Select Certificates from Add/Remove snap-in.   STEP 4.   Select Computer Account from Certificate Snap-in. STEP 5.    Click Next and do all of the necessary stuff on the way. STEP 6.   Select Personal->certificates from  mmc console. STEP 7.   After that select the certificate you need to export and click right button of mouse and from All Tasks select export . STEP 8.   Just follow necessary stuff and get your certificate by instruction from next click. For Edge server certificate follow the...
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How to export root certificate from directory control in lync 2010/2013.

To enable a lync user 3 certificates are necessary. These certificates are exported from lync server, edge server and directory control. Certificate for specific services: 0. Root CA 1. SIP services. 2. AV/Edge services. 0. Root CA: You can get it from lync dc or directory control. Most of the case it is windows 2008 R2 sevrver edition. STEP 1. Open IIS Manager from all programs and navigate to the level you want to manage. STEP 2.   In Features View , double-click Server Certificates . STEP 3.   Select a certificate and click View from the Actions pane.   STEP 4. In view certificate go to details tab and click on  copy data to file . STEP 5.   Now click Next , give certificate save  location and select all of the necessary  attribute on the way.                            ...
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