Call::answerAction

public function answerAction($callId, $callInstanceId, $legacyMobile = "N")
{
	$isLegacyMobile = $legacyMobile === "Y";
	$currentUserId = $this->getCurrentUser()->getId();
	$call = Registry::getCallWithId($callId);
	if (!$call)
	{
		$this->addError(new Error(Loc::getMessage("IM_REST_CALL_ERROR_CALL_NOT_FOUND"), "call_not_found"));
		return null;
	}

	if(!$this->checkCallAccess($call, $currentUserId))
		return null;

	$callUser = $call->getUser($currentUserId);

	$lockName = static::getLockNameWithCallId($callId);
	if (!Application::getConnection()->lock($lockName, static::LOCK_TTL))
	{
		$this->addError(new Error("Could not get exclusive lock", "could_not_lock"));
		return null;
	}

	if ($callUser)
	{
		$callUser->update([
			'STATE' => CallUser::STATE_READY,
			'LAST_SEEN' => new DateTime(),
			'FIRST_JOINED' => $callUser->getFirstJoined() ? $callUser->getFirstJoined() : new DateTime(),
			'IS_MOBILE' => $isLegacyMobile ? 'Y' : 'N',
		]);
	}

	Application::getConnection()->unlock($lockName);

	$call->getSignaling()->sendAnswer($currentUserId, $callInstanceId, $isLegacyMobile);
}