Gradwell trunks can be used with Microsoft Lync, however in order to work we need to use Session Border Controllers (SBCs). This is because SIP usually transfers datagrams using UDP. However, Lync uses TCP as the transmission method for SIP messages. The SBCs convert traffic from UDP to TCP (or vice versa) at the edge of our network.
To use Gradwell services with a Lync deployment, you need to purchase licences to use the SBCs and configure your trunk to use the SBCs.
Purchasing SBC licences
After you have purchased your Gradwell trunk service, login to the VoIP control panel and click on Packages in the top menu.
Select to add a new package and then select SBC Licence from the services list. You will be taken through the purchase process for the licences to be added to your account. You need to purchase a licence for each concurrent call that you expect to have.
Applying SBC licences to your inbound trunk
To apply the licence to your outbound trunk, click on SIP Inbound in the main menu.
Select the trunk you wish to apply SBC routing to using the tickbox alongside it (you can configure more than one trunk at a time. You can then use the Update settings box below to edit the settings.
In the Platform dropdown select Microsoft Lync (or OCS). This will automatically select the E.164 number format for your inbound number, which Lync requires, and selects the system to use our SBCs.
If you need to update the IP address of your Lync deployment, enter the new IP address into the Mediation server field.
Ensure that Use SBC is set to Yes.
Once you have completed your changes, click Apply Settings.
Your trunk will now be configured to route via the SBCs.