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Skype for Business and Sonus–Part 6–Getting around NAT

In Part 5 we discussed how to handle encrypted signalling and media. In this article we will be discussing how to configure the Sonus SBC to work behind a NAT firewall. If you have been following this blog series, in part 1 we discussed the recommended connectivity setup. This was to connect the SBC directly to your WAN by public IP address. However, there are some (actually majority) of customers who have a network configuration that is not optimised for this type of connectivity. In these scenarios, the SBC usually sits behind the network edge firewall and services are passed through from the outside world to the SBC using NAT.

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Skype for Business and Sonus – Part 5 – Adding Encryption

In Part 4, we discussed and walked through how to connect the SBC up between the PSTN and Skype for Business using simple unencrypted signalling and media. In this article we will discuss how to create a secure connection to Skype for Business and encrypt the media traffic between them.

The first thing we must do is request and install an SSL certificate on the SBC. This can be from either a trusted SSL provider (if you are connecting to external services over TLS too) or from your internal PKI system, if you are encrypting internal traffic only.

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Skype for Business and Sonus – Part 4 – Connecting it all together

In Part 3 of this series, we configured Skype for Business for enterprise voice and added the Sonus SBC to the topology as an available PSTN gateway. In this article we will discuss and walkthrough how to accept telephone calls from Skype for Business and route to the PSTN and vice versa.

Before we begin with the walkthrough guides, let’s take a moment to discuss how the SBC will handle this. As we go through this guide you will hear words like Signalling Group (SG), Transformation Table, Call Route, Media List, SIP Server table etc. Don’t be alarmed by the time this is over, you will be comfortable with these terms and what they mean and their role in the successful call flow. To begin with I will show you the call setup (signalling) workflow through the SBC from Skype for Business to the PSTN.

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Skype for Business and Sonus – Part 3 – Configuring Skype for Business

In Part 2 we discussed and walked through how to configure the Sonus SBC system settings including networking, security and other system dependencies. In this article we will be configuring Skype for Business to use the Sonus SBC as an appropriate gateway to the PSTN for Enterprise Voice. To begin with we will be making the connection using unencrypted TCP connections to make it simple. TLS trunk configuration will come in a later article that will cover some common advanced configurations and settings.

As part of this article we will setup the gateway and trunk inside Skype for Business, create a simple dial plan and voice policy and assign a user a DDI so that we can test inbound and outbound calling later on. Please excuse the briefness of some topics as this article assumes a level of competency with Skype for Business.

Firstly, please make sure that you have a DNS record configured for your Sonus SBC in your internal DNS zone. This record is a simple “A” or pointer record to the SBC IP. Alternatively, an IP address of the SBC can be used instead of the FQDN for TCP connectivity.

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Skype for Business and Sonus – Part 2 – Configuring the Foundations

In Part 1 we discussed the basics of where and how to install the Sonus SBC. In this article we will be discussing how to prepare the SBC 1000 for production readiness including; licencing, updating, controlling access, networking and system settings.

It is important to set solid footings in order to ensure easier administration moving forward and for proper security.

Licencing

The first task I undertake is to licence the SBC. Out of the box, the device is pretty much an expensive book stop. With no licence applied, essentially all you can do is make one registration to the SBC but no calls can be placed through the device. Gather your device serial number you obtained from part 1. When you purchase an SBC the device should be accompanied by an email from Sonus that provides a link to their self-licencing portal and access code. If you do not have this email, please contact your supplier to obtain this. Once submitted your licence key will be provided to you via e-mail. This e-mail can take about 5 minutes to arrive, so don’t panic if it not sitting in your inbox immediately. The key is hash of your device serial number, the features purchased and the validity period of the licence. Copy the licence key to your clipboard and from your SBC, click on Settings tab > System > Licensing > Install New License

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Skype for Business and Sonus – Part 1 – Getting Started

If you have deployed Skype for Business and now your company wants to introduce enterprise voice functionality for users, you may well find yourself looking for supported telephony equipment. There are a number of vendors out there that provide SIP connectivity hardware for Skype for Business. However, here in the UK, it seems that Sonus Session Border Controllers (SBCs) are the number one, preferred choice over the other competitors.

This article does not go into detail over which device is best for you, that is down to your own informed choice. However, if you have landed on this post then there is a good chance that you have already decided to use Sonus SBCs and got your hands on either the 1000, or 2000 SBC model.

This article is the first in a series, that provides step by step guides on configuring the Sonus SBC with Skype for Business in order to provide PSTN connectivity for your SfB users. Before we start jumping in and configuring the SBC, we must first understand how the functions on the SBC work.

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Connecting Sonus SBC 1000 to Exchange Online UM

In my latest venture, I have been tasked with connecting a customer’s Cisco CUCM deployment with Exchange Online UM provided by Office 365. In order to achieve this, and because Office 365 does not support direct SIP trunks between itself and CUCM, we had to deploy a Session Border Controller (SBC) in the middle.

The model chosen was a Sonus SBC 1000 3-DSP SIP:SIP licensable SBC for its ease of configuration and support with Microsoft technologies.

Now, Sonus have provided a relatively high level document on configuring this process, and although the document was designed using software version 2.2, it is still relevant in the latest 4.2.1 release.

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