Thread and merge call conversations

Problem
Each inbound or outbound call creates a new separate conversation in Front, even when calls are related to the same customer issue. Unlike email conversations, call conversations cannot be threaded or merged, resulting in duplicate tickets, fragmented context, and reduced team visibility when managing high call volume.

Request
Provide the ability to thread or merge multiple call conversations related to the same issue, similar to how email conversations can be merged, to keep related calls together and maintain complete context.