Hi Shankar.Paulraj,
Welcome to post in our forum.
Based on your description, you may want to deploy high availability for CCE, for this question, within a single PSTN site, you could deploy multiple instances of cloud connector for high availability.
You can deploy the following Cloud Connector topologies:
1.A single instance of Cloud Connector Edition per PSTN site. This topology is recommended for evaluation purposes only because it does not provide high availability.
2.Multiple instances of Cloud Connector Edition (up to 4) per PSTN site to provide high availability.
3.Multiple PSTN sites with multiple instances of Cloud Connector Edition to provide scalability with high availability. You can deploy up to 200 sites.
The following blog is for your reference
https://technet.microsoft.com/en-us/library/mt605227.aspx?f=255&MSPPError=-2147217396
Hope this reply helpful to you.
Regards,
Alice Wang
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