sundance-communications.com Forums Telephony Discussion Phone & VoIP Systems Yealink Telephones & Systems Cisco Spark for small business

Hi, everyone
I am new to this site, I joined here as I am a small business owner and found this community is very useful for fixing common problems related to telephones.
For our business I am using VoIP services from ThinkTel and last day while checking my profile on the site, I found a service named Spark from Cisco. Here at our office, we are using Cisco networking devices and VoIP phones. As of now we are using a personal version of Skype, what are the advantages of going with Spark?

https://www.thinktel.ca/services/thinktel-voice-services-cisco-spark/

What are the advantages of these kind of end-end communications over traditional apps like Skype?