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what default codec of lync 2013 , G.711 A-law or G.711 U-law or the other codec RRS feed

  • Question

  • Hi Support ,

    what default codec of lync 2013 , G.711 A-law or G.711 U-law or the other codec ?

    Warm Regards,

    Faizal

    Saturday, November 8, 2014 10:48 AM

Answers

  • There's no quick or easy answer because it varies based upon the reason for the session. A peer to peer call may use a different codec than a Lync mobile call which is different than a conference. When g711 is offered, both U and A will be offered with I belive a preference towards U. Check out Johan's article for interesting detail: http://www.proexchange.be/blogs/lync2013/archive/2014/03/13/flashback-from-lync-conference-what-audio-codecs-does-lync-actually-use.aspx

    Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer". SWC Unified Communications

    This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 9:43 PM
  • Hi,

    If it is a Lync to Lync call the default Codec is RTAudio WB.

    Check this

    http://technet.microsoft.com/en-us/library/jj688118%28v=ocs.15%29.aspx


    Whenever you see a helpful reply, click on Vote As Helpful & click on Mark As Answer if a post answers your question.

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 3:23 PM
  • Hi Faizal,

    for Lync to Lync calls , Lync uses RTAudio for voice calls , it is a Microsoft protocol that copes to the changes in the network traffic & congestion to deliver a good quality voice call.

    Lync 2010 as well as Lync 2013 also support G.711 codec which is good option to use in case your IP-PBX or Media gateway support "Media Bypass", then Lync client will talk directly to the IP-PBX or media gateway without passing the "Media" traffic through the Mediation server, good option to use in case the IP-PBX and/or media gateway in the same LAN.


    If you find this helpful

    please click "Vote as Helpful" if it answered your question please click "Mark as Answer"

    Mostafa Eltohamy

    Blog: http://Lyncdude.com  Twitter:   LinkedIn:   XING:

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 4:02 PM

All replies

  • Hi,

    If it is a Lync to Lync call the default Codec is RTAudio WB.

    Check this

    http://technet.microsoft.com/en-us/library/jj688118%28v=ocs.15%29.aspx


    Whenever you see a helpful reply, click on Vote As Helpful & click on Mark As Answer if a post answers your question.

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 3:23 PM
  • Hi Faizal,

    for Lync to Lync calls , Lync uses RTAudio for voice calls , it is a Microsoft protocol that copes to the changes in the network traffic & congestion to deliver a good quality voice call.

    Lync 2010 as well as Lync 2013 also support G.711 codec which is good option to use in case your IP-PBX or Media gateway support "Media Bypass", then Lync client will talk directly to the IP-PBX or media gateway without passing the "Media" traffic through the Mediation server, good option to use in case the IP-PBX and/or media gateway in the same LAN.


    If you find this helpful

    please click "Vote as Helpful" if it answered your question please click "Mark as Answer"

    Mostafa Eltohamy

    Blog: http://Lyncdude.com  Twitter:   LinkedIn:   XING:

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 4:02 PM
  • There's no quick or easy answer because it varies based upon the reason for the session. A peer to peer call may use a different codec than a Lync mobile call which is different than a conference. When g711 is offered, both U and A will be offered with I belive a preference towards U. Check out Johan's article for interesting detail: http://www.proexchange.be/blogs/lync2013/archive/2014/03/13/flashback-from-lync-conference-what-audio-codecs-does-lync-actually-use.aspx

    Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question please click "Mark As Answer". SWC Unified Communications

    This forum post is based upon my personal experience and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

    • Proposed as answer by Eason Huang Monday, November 10, 2014 8:53 AM
    • Marked as answer by Eason Huang Monday, November 17, 2014 3:02 PM
    Saturday, November 8, 2014 9:43 PM
  • Hi,

    For SIP Trunking, Lync Server 2013 supports only the following codecs:

    G.711 a-law (used primarily outside North America)

    G.711 µ-law (used in North America)

    Best Regards,

    Eason Huang


    Eason Huang
    TechNet Community Support

    Monday, November 17, 2014 3:01 PM
  • Hi Eason,

    I know this is an old thread but this question is directly related to your post.  I was experiencing one way audio with certain callees through ITSP sip service.  lync --->audiocodes--->ITSP

    My SDP invite looked like this:

    v=0

    o=- 21352 1 IN IP4 192.168.0.60

    s=session

    c=IN IP4 192.168.0.60

    b=CT:1000

    t=0 0

    m=audio 51322 RTP/AVP 97 101 13 0 8

    c=IN IP4 192.168.0.60

    a=rtcp:51323

    a=label:Audio

    a=sendrecv

    a=rtpmap:97 RED/8000

    a=rtpmap:101 telephone-event/8000

    a=fmtp:101 0-16

    a=rtpmap:13 CN/8000

    a=rtpmap:0 PCMU/8000

    a=rtpmap:8 PCMA/8000

    a=ptime:20

    They responded with two codecs in 200ok:

    v=0

    o=BroadWorks 46590870 1 IN IP4 X.X.X.X

    s=-

    t=0 0

    m=audio 29636 RTP/AVP 0 8 101

    c=IN IP4 X.X.X.X

    a=rtpmap:0 PCMU/8000

    a=rtpmap:8 PCMA/8000

    a=rtpmap:101 telephone-event/8000

    a=fmtp:101 0-15

    Lync then received PCMU but was sending PCMA which resulted in one way audio.  I had to remove the PCMA from initial invite in my audiocodes device for full audio.  Any ideas why lync mediation server would split send PCMA but select PCMU to receive?  

    Brandon


    Friday, May 27, 2016 6:27 PM