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10 changes: 10 additions & 0 deletions fern/products/platform/changelog/2026-10-19.mdx
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tags: ["apis", "voice"]
---

## `transport` added to dial requests for external SIP destinations

Choose UDP, TCP, or TLS for SIP signaling when you dial a SIP URI outside SignalWire with
[Send call commands](/docs/apis/rest/calls/call-commands). The transport also controls media
encryption: `udp` and `tcp` send unencrypted RTP, while `tls` offers SRTP. A request returns
`422` when `transport` conflicts with a `;transport=` parameter in the `to` URI.
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