No Ringback Heard by Caller – Skype for Business & Audiocodes

This problem presented itself at one of my customers a couple of weeks ago. I thought it was an interesting case that I should share this incase you find yourself in a similar situation. The problem started withe an e-mail to me from a current client saying “Please can you help? When someone calls our… Read More

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Skype for Business and Establishing Media Deep Dive

Following on from my blog post on the basics of SIP call setup, I wanted to build on that to incorporate how media is negotiated between clients. Again, this topic has been blogged by others and the purpose of this is to put my understanding into my own words so that I understand and if… Read More

Legacy PBX Number Presentation to Skype for Business Using Sonus SBCs and AD based RNL

A customer messaged me last week and asked me a question regarding number presentation to Skype for Business when users still on their legacy PBX system placed a call to a Skype for Business endpoint. The customer explained to me that when a Skype for Business user called an extension on their legacy PBX system,… Read More

Skype for Business and Sonus–Remote Site Survivability (an alternative approach)

When deploying Skype for Business to medium sized organisations, the main challenges tend to be around how to ensure that remote sites adjacent to the main headquarters remain online for as long as possible in the event of an infrastructure failure. If you follow the Skype for Business architecture, you will know that the best… Read More

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… Read More

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… Read More

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… Read More

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… Read More

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… Read More

Skype for Business – Is CloudPBX Enterprise Voice?

With Microsoft’s latest announcement that they are bringing PSTN voice calling to the Office 365 public cloud offering and released tech preview trials in the USA recently has left the industry in a flurry of excitement, rumour and ponder. Partners are hurriedly preparing presentations, marketing material and sales pitches. Customers are beginning to plant the… Read More