Appends query parameters to a media-websocket URL, preserving any query it already carries. Pure —
the inbound answer webhook and the outbound createCall NCCO both use it so the call identity + token
ride the same URI shape.
Parameters
mediaUrl: string
The configured wss://…/telephony/vonage/media URL.
params: Record<string,string>
Query params to append (name → value); values are URL-encoded.
Appends query parameters to a media-websocket URL, preserving any query it already carries. Pure — the inbound answer webhook and the outbound
createCallNCCO both use it so the call identity + token ride the same URI shape.