Collab OneContact is an all around platform that can be used in any situation. It can be used in situation where there isn't a PBX. I've seen some solutions where the platform is integrated, using SIP with a CUCM.
Kixie integrates seamlessly with our CRM (Zoho), meaning it updates call notes directly on the customer's CRM profile.
The one-click dialing feature directly through our CRM is a great feature. It's so simple; just search for a name, one-click, and you are on the phone.
The local presence feature is a nice touch for cold calls. It provides a local area code when cold calling to increase the likelihood of an answer to the call.
Kixie provides a nice user interface. There is a bit of a learning curve to load leads but it's not difficult. It's just learning where to go and how to load lists for the reps. Once you have it figured out, it's easy to get lists loaded for reps and give them the ability to manage those leads
CUCCX is a great platform but it can't be considered when working with other manufacturers, even if they support SIP. For this reason, when you're building a network that isn't just installed by one provider, I would suggest an approach different from CUCCX (considering VoIP and CC platforms, not routing or switching). OneContact allows the integration between platforms, allowing short number dialing between different contexts, recording other advanced telephony solution. Collab's Customer interaction Hub is a great solution for clients that need a CRM, but don't need much complexity, this mini-CRM is a great asset against the competition and facilitates the deployment of an omni-channel Contact Center.