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when doing a cold transfer with SIP REFER, how can I set some custom sip headers?

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To set custom SIP headers during a cold transfer with SIP REFER in LiveKit, you can use the `TransferSIPParticipant` API. This allows you to transfer calls to any valid telephone number or SIP URI. Additionally, you can map custom `X-*` SIP headers to participant attributes, which can be used for routing calls to different workflows or other purposes.
For more details, you can refer to the documentation on cold transfers and custom attributes:
• <https://docs.livekit.io/cold-transfer|Cold Transfer Documentation>
• <https://docs.livekit.io/custom-attributes|Custom Attributes Documentation> Sources: <https://docs.livekit.io/sip|SIP overview | LiveKit Docs> | <https://docs.livekit.io/sip/api/|SIP APIs | LiveKit Docs>