Find all needed information about Lync Dtmf Support. Below you can see links where you can find everything you want to know about Lync Dtmf Support.
https://matrixsust.blogspot.com/2013/08/dtmf-or-telephony-event-support-on-sdp.html
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.
https://support.microsoft.com/en-us/help/2254369/avmcu-does-not-support-dtmf-in-lync-or-sfb-server
Sep 12, 2019 · The AVMCU feature in Lync Server 2010, Lync Server 2013, and Skype for Business Server does not support DTMF relay. Workaround To work around this issue, join the Lync or Skype for Business conference by using Skype for Business or Lync client, and then make a peer-to-peer call to the remote party that requires DTMF tones.
https://docs.microsoft.com/en-us/skypeforbusiness/lync-cert/qualified-ip-pbx-gateway
On Lync Mediation Server, Enable Media Bypass and Disable REFER and RTCP. Testing determined that Mitel does not support REFER and RTCP. Known Limitations: When a Mitel user calls a Lync user, there is no ring back tone provided for the Mitel user. Mitel is investigating adding RFC 3960 support in the future. Mitel does not support comfort noise.
http://blog.schertz.name/2014/03/media-codecs-in-lync-2013/
Mar 31, 2014 · The specific variant supported by Lync 2013 is a single narrowband (32 kbps) option which results in a lower bit rate stream of comparable quality to G.711 audio. Some of the Lync-compatible IP desk phones natively support this codec and in theory could negotiate G.726 instead of G.711 in constrained bandwidth scenarios.
https://social.technet.microsoft.com/forums/lync/en-US/850b44e9-98fc-446a-be9e-c4e9cb88a643/strange-dtmf-issue
Nov 12, 2012 · In your case, PBX does not send any information about DTMF support (look the SDP from PBX - no a=fmtp: attribute) to Medianat, and the later have no chance but to pass "a=fmtp:18 annexb=no" to Lync. Lync however, expects to receive DTMF support information and rejects the call because one is not offered. Drago
https://support.office.com/en-us/article/Join-a-meeting-or-conference-call-by-phone-17930664-5940-46BB-9AF3-904C8D05DDEE
Join a meeting or conference call by phone. Join a meeting or conference call by phone. For most Lync conference calls, joining is as simple as dialing the conference call number. As soon as you’re connected to the call, you can mute your line or hear a list of people on the call by using DTMF commands.
https://www.audiocodes.com/media/7886/sip-trunking-in-lync-networks-the-simple-way-out.pdf
packet loss, delays, jitter, DTMF transmission issue, as well as supporting flexible transcoding, fax handling and conversion from RTP to SRTP. Bottom line Deploying an SBC to connect your Lync implementation to SIP trunks is a simple and highly effective way to avoid headaches and limitations as your deployment progresses. Read on to learn more...
https://docs.microsoft.com/en-us/lyncserver/lync-server-2013-optional-modify-key-mapping-for-dtmf-commands
To modify the key mapping of DTMF commands. Log on to the computer as a member of the RTCUniversalServerAdmins group, or as a member of the Cs-ServerAdministrator or CsAdministrator role. Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Management Shell.
https://community.cisco.com/t5/ip-telephony-and-phones/cue-ivr-transfer-to-lync/td-p/2001415
SIP/2.0 488 Invalid incoming Gateway SDP: Gateway ParseSdpOffer Error: No DTMF support on Gateway side. On the Lync side we can do nothing, On the Cisco side can we use sip-profiles to 'force' DTMF support in the SIP INVITE? And if so what exactly …
https://www.voipmechanic.com/dtmf-issues.htm
VoIP & Issues with DTMF. DTMF (Dual Tone Multi-frequency) are signals/tones that are sent when you press a telephone's touch keys. These tones (or data signals) are used to access voicemail (passwords) and navigate IVRs or attendants for large companies like banks.
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