> For the complete documentation index, see [llms.txt](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions.md).

# IV. Frequently asked questions

- [1. Forget a password](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/1.-forget-a-password.md)
- [2. Change a language](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/2.-change-a-language.md)
- [3. Permissions for devices (headset/microphone)](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/3.-permissions-for-devices-headset-microphone.md)
- [4. Setting the method of call distribution for agents](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/4.-setting-the-method-of-call-distribution-for-agents.md): Only applicable to user accounts with Admin permission
- [5. Convert contacts from one account to another completely](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/5.-convert-contacts-from-one-account-to-another-completely.md)
- [6. Note when uploading contacts via excel file](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/6.-note-when-uploading-contacts-via-excel-file.md)
- [7. Delete contacts in bulk](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/7.-delete-contacts-in-bulk.md)
- [8. Merge duplicate contacts](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/8.-merge-duplicate-contacts.md)
- [9. Check a current balance of a portal](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/9.-check-a-current-balance-of-a-portal.md)
- [10. Manage app notifications](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/10.-manage-app-notifications.md)
- [11.  Clear browser cache](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/11.-clear-browser-cache.md)
- [12. Configure IP Phone connection with Stringee contact center](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/12.-configure-ip-phone-connection-with-stringee-contact-center.md)
- [14. SIP TRUNK number](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/14.-sip-trunk-number.md)
- [13. Common errors when making calls](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/13.-common-errors-when-making-calls.md)
- [16. Call center fee (Hotline number)](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/16.-call-center-fee-hotline-number.md)
- [14. Log in and report Captcha Invalid error](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/14.-log-in-and-report-captcha-invalid-error.md)
- [15. How to change IVR/Queue waiting ringtone](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/15.-how-to-change-ivr-queue-waiting-ringtone.md): With actual changing needs, it is necessary to change the waiting ringtone to suit the business from time to time
- [15. How to create multiple business hours](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/15.-how-to-create-multiple-business-hours.md)
- [20. How to set up voicemail (leave a message when no agents answers the phone)](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/20.-how-to-set-up-voicemail-leave-a-message-when-no-agents-answers-the-phone.md)
- [16. File formats supported on StringeeX](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/16.-file-formats-supported-on-stringeex.md)
- [22. What is the number of concurrent calls?](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/22.-what-is-the-number-of-concurrent-calls.md)
- [17. Instructions for getting call code (call ID)](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/17.-instructions-for-getting-call-code-call-id.md)
- [18. Using Google and Microsoft Accounts for Registration, Login, and Account Linking](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/18.-using-google-and-microsoft-accounts-for-registration-login-and-account-linking.md)
- [19. Two-factor authentication](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/19.-two-factor-authentication.md): Two-factor authentication will enhance user account security by adding an additional verification step, preventing unauthorized access to steal data.
- [20. Incoming calls have popup but no ringtone](https://help.stringeex.com/stringeex-tong-dai-cham-soc-and-quan-ly-khach-hang/en/iv.-frequently-asked-questions/20.-incoming-calls-have-popup-but-no-ringtone.md)