The Skype for Business on Mac client requires Mac OS X El Capitan and higher, and uses at least 100MB of disk space. Hardware and software requirements for Skype for Business on Mac. The Skype for Business on Mac Client is available for download.
![]() Skype For Business Known Issues Software Requirements For![]() In a conferencing scenario the same thing happens, however, because of the possibility of joining a meeting anonymously, the Front End server checks to see if a meeting exists, and then gets and passes the credentials to the anonymous meeting participant.This is the process of determining the best possible candidate for the session. Credentials are valid for 8 hours, and for this period the client can now communicate directly with the Edge server. The AV Edge service creates credentials using the AV Edge certificate for the Front End server which sends a 200 OK back to client with the Edge server it should connect to, ports and username and password. Because the Edge server is not on the domain it can’t authenticate client directly, so the Front End server requests the credentials on behalf of the client. With this, the client sends a SIP service request to the Front End server which includes the client’s location (internal or external). The server provides a 200 OK which includes in-band provisioning details, including MRAS (audio or video relay authentication services) which tells the client there is an Edge server deployed. Relay/TURN Candidate (UDP) – In the event that STUN fails then the final option is to utilise the Edge Server as a media relay. The reflexive IP address is the public IP address of the external user e.g. This scenario involves attempting to connect to the reflexive IP addresses for each externally connected user. Reflexive/STUN Candidate (UDP) – The next preferred option is to use the server reflexive candidate which is provided by the Edge Server using STUN. Host/Local Candidate (UDP) – The most preferred candidate is always a local candidate and is the reason that peer to peer audio or video sessions between clients on the same network will never use the Edge server. TCP Relay is a last resort. Relay/TURN Candidate (TCP) – when connectivity is not available on UDP. This connectivity is relayed through the public IP address of the Audio/Video Edge service. In SIP 200 OK Peer picks up the call. You may see multiple – one for each end point. In SIP 183 Peer sends its candidates. Candidates come in peers – one for Real-time Transport Protocol (RTC) and one for RTP Control Protocol (RTCP).A=candidate 1 1 Protocol (UDP/TCP Passive – candidate I expect to send traffic to /TCP Active – candidate that sends me traffic) priority (high best) IPAddress Port Typ(host/relay/server reflective)A=candidate 1 2 UDP priority (high best) IPAddress Port Typ (host/relay/server reflective). OCS r2+ uses V19, but both are included for backward compatability. The first set of candidates is ICE v6 (ms-proxy-2007 fallback) and a second set is ICE V19. Get client logs from a fresh sign-in – is there MRAS? If no, it can’t talk to the Edge server. Get Snooper installed to make reviewing the client and server logs easier. In SIP 200 OK Includes other party’s final candidates.Troubleshooting Audio or Video Connectivity Out INVITE Re-invite which will include the 1 chosen candidate pair as decided in the earlier process. ![]() I've been trying to get a handle on the entire process as we have deployed Lync 2013 in our environment (without enterprise voice), One question I can't seem to find an answer on is, what path does an external client that is using Lync Web App take when connecting to a conference for desktop sharing. The final re-invite will include this, but the result may not be in logs for a few seconds after connection.You are now ready to troubleshoot Skype for Business audio not working!Hopefully, you found this article useful and next time you have a Skype for Business audio not working issue you’ll have some new tools to help you.Thanks to Thomas Binder for this excellent deep dive as well as Jeff Schertz for his summary.Good summary. After a call is picked up, it can take several seconds before the final candidates are chosen and audio or video paths are subject to change. This traffic will all drop because I was under the impression that communication with the front end servers or internal clients should go through the edge internal interface due to our persistent routes on edge.I started exploring the log files and candidate lists. I see the external edge ip trying to talk to the front end server ip on 3478 stun and occasionally other 50,000 or higher ports, as well as the front end server trying to talk to the external edge ip in the 50,000 range. Looking at our firewall logs, I see dropped communication between our front end server ip's and the external edge nic ip's. Mac ads cleaner itIt also shows the relay address of the edge's external ip.Looking at the logs on the lwa client, I see a candidate list that looks correct for its local ip information, but I also see candidate lists show up which list the information for our front end server as well. What seems odd is that, the internal client then receives a SIP 200 OK with a candidate list, but the list is the local ip of the front end server's nics (both the ip of the default nic for communication and the ip of the nic used to connect to some back end storage for the lync file share). I also see the relay ip of the external edge ip in the list. It sends an invitation and has its local ip of typ host on tcp-act and tcp-pass.
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