Call transfer via Zadarma SIP

Hello Team,

I've created a transferCall Tool with a standard configuration. When the tool is triggered, the call gets disconnected.

Call ID: e722b66e-75d5-4cd8-b47c-cecf97608031

Timestamp: 24/06/2025 14:17:59 UTC

Tool ID: 2e280b0b-f96f-4f38-ad74-1708bffb7f0f

I use a SIP and a virtual number from Zadarma. They work well for standard inbound and outbound calls made by VAPI assistants.

Please advise if I need to apply any specific setup for Zadarma to make call forwarding work.
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