Is this correct? The 'lyncwebext' name is just an example I used to reflect the Lync Web Services name. Just to be cristal clear, in a split DNS — you don't create a lyncdiscover record internaly at all — only the lyncdiscoverinternal record point to the FE. Do I need hair-pinning when all mobile clients are connecting from internet directly to Reverse proxy external interface? I have only public Lyncdiscover available, LyncdiscoverInternal is not present because nobody is connecting from internal. I have an issue, when user is connected via Mobile client and is timeouted to static registration only after few hours inactivity , device is not waking up when you try co make a lync call.

Device is recieving push notification and trying to contact reverse proxy but ends with:. You should still deploy the Lyncdiscoverinternal record as internal Windows Lync clients will leverage that. If this is some type of hosting environment and there will never be any internal clients of any type then I suppose you could omit that record.

Hi Jeff, great article. Ive been looking for a solution to my mobile clients. So far Android client is working but not ios or WP. I really appreciatte your answer. Hi Jeff, Is contact picture set in Lync client also supposed to display on Lync Mobile client? If yes, do we need to do allow this through policy?

I can see picture on Lync Client. Contact photos work in the mobile clients, but I don't think there is a way to block them for only the mobile clients and not disable them for others at the same time. They should be working by default. Thanks for this great article. I have been having issues getting external clients to work. Could it be because I am using the same DNS name lyncpool. I tried using the Lync connectivity tool from the outside and it always tells me that my SSL certificate is invalid purchased from GoDaddy.

I imagine that might cause some major issues.

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You'll need to update your topology and request new certificate after defining a unique external web service FQDN. Thanks for your blog, it has been very helpful in deploying my lync but I am having challenges with lync external users. I tried to examine the problem and I noticed that the link returned for them is the internal link instead of external.

This I confirmed by using lync connectivity analyzer. Please what can I do to correct this problem. Thank you. I can't say what the issue would be for your specific deployment. I recommend posting a question to the TechNet Lync discussion forum for a timely response. Great write-up. So how do I convince my "security guys" that allowing non authenticated traffic through a reverse proxy to the internal network is safe?

Jeff, nice post. I had a question, which is unrelated to this post of yours. Hoping to get some directions from you. I have a requirement where I want to set multiple conferencing policies based on the selected features I am enabling in Lync for different policies. How can I acheive this automation on the Lync conferencing policy which can dynamically change on user attribute change of AD? Any help would be greatly appreciated. I have seen a couple of organizations route all internal traffic through their Edge and Proxy with no issues.

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I am not sure how this would affect pool pairing with another site either. Mikey, if you intend it to support all client connections via external services and the topology is sized correctly to do so then that is fine. If for readers unaware of this behavior who assume that the majority of connections are directly to the internal Pools this could have a major impact if the Edge pool and reverse proxy is sized for a fraction of that traffic.

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Now we are facing problem with lync mobile client to connect through 3G internet over the WAN. As per your blog, we have decided to separate internal and external URL as lync. I have below queries : 1 whether I am able to resolve mobile client issue by changing URL as per above?

Jeff, I am a big fan of yours and rely on your blog a lot. Every single functionality is working perfect squeaky clean. The one strange issue I am having is as follows. Can have IM conversations with corp user or federated user. Interestingly this happens only for iphones and Android's. Have you ever seen such a problem elsewhere? Any insight will be helpful.

I have been working with Microsoft Partner technical support for the past 6 weeks and no resolution so far. We have engaged Microsoft Premier support for this. Its been 6 weeks and they are still scratching their heads. Did you ever reach a resolution on this problem? One of the sites that I look after is experiencing exactly the same problem. Although initial connection and signalling go via Reverse Proxy, the media goes via the Edge. However, users that are signed in from outside our network seem online but they are not recieving messages sent from within the network.

What can possible be wrong? How can I troubleshoot? Not sure what could be causing that as IMs are delivered in-band so if the external clients are successfully registered I can't say that I've ever seen issues like that before. Yeah, I know it is very strange. Do you know what parts of the debugger tool I should be using to see where the trafic is going? Hi Jeff, We have successfully configured Lync but are having problems with mobile clients. Do you have any idea on what might be causing this? I would like to know your thoughts on how you handle having BYOD scenarios.

When using the lyncdiscoverinternal the mobile device complains about CA certificate. When using lyncdiscover via Reverse proxy, then of course all clients start autodiscovering via the reverse proxy. Do you assign a trusted Public Certificate to the Web services on the front end? Or do you setup a new DNS just for Wifi users? Using public certificates on the Front End servers is the easiest way to solve the issue, but that may not be possible if the internal AD domain and or SIP domain names are not valid TLDs that cannot be validated by a third-party certificate authority.

If that is the case then the devices would need to be provisioned with any private CA certs via some custom enrollment solution. A question around mobility for clients on VPN with Lync. I did all of your considerations about configuration Lync Mobility, and I can sign in to with my cell phone and Tablet both of them have the same android version 4. This might not be the best place to ask you this, but it can be useful to others if you know a solution. The best one I found is im: which at least opens an IM and you can press the Video Call Button, but I was thinking if there is some specific format that Lync only uses and will not overlap with other sip clients.

Have you find the solution for this issue. If I manually enter the server address in Lync mobile app, what address should it be for Internal Discovery Address and External Discovery Address?

If I use lyncdiscoverinternal. Please check your account info and try again. Kindly advice me.

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Thanks a lot. The challenging part is the there are 5 Sip domains, and unfortunately they were trying to use wildcard certs for everything. I installed the certs and intermediate certs on my phone, too. With the Skype for Business app, I can login, sync my presence, search the address book, and find users. Please try again…. Then my app says Connecting and just sits there.