CallNegotiateContent

fun CallNegotiateContent(    @Json(name = "call_id") callId: String,     @Json(name = "party_id") partyId: String? = null,     @Json(name = "lifetime") lifetime: Int?,     @Json(name = "description") description: CallNegotiateContent.Description? = null,     @Json(name = "version") version: String?)