CCrmCallToUrl::Format

static function Format($value)
{
	$value = self::NormalizeNumberIfRequired($value);

	$format = self::GetFormat(self::Slashless);
	if($format !== self::Custom )
	{
		if($format === self::Slashless)
		{
			return "callto:{$value}";
		}
		return "callto://{$value}";
	}

	if(!self::$URL_TEMPLATE)
	{
		self::$URL_TEMPLATE = new CCrmUrlTemplate();
		$settings =  self::GetCustomSettings();
		self::$URL_TEMPLATE->SetTemplate(isset($settings['URL_TEMPLATE']) ? $settings['URL_TEMPLATE'] : 'callto:[phone]');
	}
	return self::$URL_TEMPLATE->Build(array('PHONE' => $value));
}