skype for business on office 365 Connectivity Configuration with On-Premise Skype for Business 2015

Hi Skype for buiness experts

we have on premise skype for business in our environment

how can i let our users make conference calls with  users who use office 365

i know that we can make  free Skype Connectivity Configuration with On-Premise Skype for Business 2015

https://blogs.technet.microsoft.com/canitpro/2015/11/09/step-by-step-skype-connectivity-configuration-with-on-premise-skype-for-business-2015/

but now my issue skype for business on office 365 Connectivity Configuration with On-Premise Skype for Business 2015

i saw something like this on-line

https://docs.microsoft.com/en-us/skypeforbusiness/skype-for-business-hybrid-solutions/plan-hybrid-connectivity

but we dont have anything realted to ms CLOUD or office 365

do we have to buy something in order to be able to configure connectivity between our SFB and office 365 SFB


kindly advice
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sword12Asked:
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
Hi Sword12,
You need to have Office365 subscription to have Skype Hybrid.
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sword12Author Commented:
So we have no way to let our local users to have conferences with office 365 users

If no way

Can we buy only 1 or 2 office 365 in order to use them for hybrid configuration

Can you advice me what I can do to meet this target without spending a lot of money
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
You can buy as per your budget and configure hybrid.
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Jian An LimSolutions ArchitectCommented:
if you are on-premises skype for business user, you should able to interact with another skype for business user provided you have a "EDGE server" Or Federation setup.

do you have external federation setup on your on-premises environment?
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
I have SFB Edge server.

-->do you have external federation setup on your on-premises environment?
Yes
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sword12Author Commented:
Yes we have edge servers and reverse proxy server

And our users can use their devices from outside our network to talk

Plus they can generate url from outlook and send it to anyone to join the meeting via web browser

My point we have some external company we work with they have office 365 with Skype and they want to use their Skype client to search for our users which they have on premise Skype

So how can I offer them ability to to use their Skype for business client to search and make conferences with our users
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Jian An LimSolutions ArchitectCommented:
By default, you cannot allow other company to search your own list . (or vice versa)

but if you know the 3rd party email address, then user can communicate (voice or conf) with them (unless you have a close federation)

Search capability = NO, regardless you are on-premise s4b or o365 s4b online
talk, conf, and etc with external user = YES
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Jian An LimSolutions ArchitectCommented:
If you want to make them able to search you, the easiest way is to export your address book (displayname, emailaddress, sip address, title and etc) and send to 3rd party so they can add these into their AD as contact.

I personally don't like this because it is very administrative; you can use 3rd party GALSync tool so you two share the contact.

This way, you can search their email address.
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sword12Author Commented:
Hi Jian
thank you for your information

let me tell you what we need maybe you can advise me
we have on-premise skype for business exactly like the attachment file
so we have edge server for external access and reverse proxy for mobile devices

now our users can make full conferencing internally and external for all users in our domain and if they want to have confidence calls with third party users they generate a URL from outlook and send it to the third party user to let them join the meeting

my question for this configuration what we can do in order to meet this requirement

1-      our users want to talk to third-party users but they have skype for business from office 365
2-      our users want to talk with users who have free skype but we don’t want to allow that free skype user or even office 365 users to search in our catalog and see our usernames or status

it is just for security reason we don’t want any free skype user or office 365 user to search  for my name for example and can see my email and my status etc we need to communicate with third-party users but we don’t want anyone to search in our AD names etc

so do you think I can do this configuration with some extra steps to reach this target and what about office 365 users also

https://blogs.technet.microsoft.com/canitpro/2015/11/09/step-by-step-skype-connectivity-configuration-with-on-premise-skype-for-business-2015/

as I said right now we do have active integration with free skype catalog plus  
enable communication with public users
  or  
enable communication with federated users in SFB control panel

another point for third-party users who has no skype client then the only way to talk with them it is to generate a URL from outlook and send it to them to join via internet browser right ? or not

not enabled in SFB control panel
kindly advice
9-25-2018-1-21-04-PM.jpg
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
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sword12Author Commented:
HI MAS

i know this i just mentioned this in my previous comment

my question for this configuration what we can do in order to meet this requirement

1-      our users want to talk to third-party users but they have skype for business from office 365
2-      our users want to talk with users who have free skype but we don’t want to allow that free skype user or even office 365 users to search in our catalog and see our usernames or status

i mean if we can use skype for business client to do this not via outlook
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MAS (MVE)EE Solution Guide - Technical Dept HeadCommented:
You have an option to add contact not in your Organization in your Skype Client. Both Skype and Skype for Business Users which is not in your organization.
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Jian An LimSolutions ArchitectCommented:
Hi sword,

based on your configuration,

1. your user can talk to any 3rd party as long as the other end have setuped properly. This is regardless the 3rd party is on Office 365 or on-premises (the 3rd party can have a close federation so they by default can't talk to you until they have done something)

2. no one can search your Address book, they can contact you by knowing your email address. Once they know your email address, they can add you and then know your name, and title and availability. Microsoft says this is by design.
How other people prevent it is by :-
a. do not use the same email address and SIP address. - personally i hate it because some one need to know what to give out their email address or SIP address.
b. used close federation. only allow the 3rd party domain that allow to talk to you. However, it kills flexibility.
you can't win between security and flexibility.
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