@Pete-S That's a commercial module that relies on using their official distro. I use PIAF, and would prefer to find an OSS if available.
I don't think there is one but Zoho CRM has full REST api, webhooks and what not, so it's certainly possible to roll your own integrations in different ways.
There are also a bunch of integrations under Zoho Phonebridge which basically connects all the different Zoho apps to a PBX.
But they are vendor based so while I'm sure many of them are using asterix under the hood, they will probably not work with something else.