calls.go
func (c *CallService) Update(ctx context.Context, sid string, data url.Values) (*Call, error) {
	call := new(Call)
	err := c.client.UpdateResource(ctx, callsPathPart, sid, data, call)
	return call, err
}
func (c *CallService) Update(ctx context.Context, sid string, data url.Values) (*Call, error) {
	call := new(Call)
	err := c.client.UpdateResource(ctx, callsPathPart, sid, data, call)
	return call, err
}
func ( c * CallService ) Update ( ctx context . Context , sid string , data url . Values ) ( * Call , error ) { call := new ( Call ) err := c . client . UpdateResource ( ctx , callsPathPart , sid , data , call ) return call , err }
// Update the call with the given data. Valid parameters may be found here:
// https://www.twilio.com/docs/api/rest/change-call-state#post-parameters
Update the call with the given data . Valid parameters may be found here : https : // www . twilio . com / docs / api / rest / change - call - state#post - parameters