The availability of a message type depends on the Infobip [solution](https://www.infobip.com/docs/telegram#available-solutions) over which you want to send the message.
  
## Chatbots
  
Chatbot messages are used as the main form of messaging when receiving incoming communications through Telegram from customers.
  
Telegram bots are third-party applications which run inside Telegram which do not require a phone number for registration. They handle all messaging processing, including all encryption and communication with the Telegram API.
  
Messages, commands and requests sent by end users are passed first to Infobip`s software and then to Telegram Bots API in the form of HTTPS requests. Note however, while bots support Telegram cloud chats, they currently do not support secret chats.
  
Once bot hosts are [set up](https://www.infobip.com/docs/get-started#telegram-bots), [connected to Infobip](https://www.infobip.com/docs/get-started#connect-to-infobip), and [configured in Answers](https://www.infobip.com/docs/answers/start-chatbot-creation#create-a-chatbot), you can search for it in your Telegram app via the search bar and test it out. You can also use the command *t.me/<bot_username></bot_username>* to initiate the conversation with your bot.
  
To learn more about bots (bot hosts), please refer to the official documentation from Telegram for more information on [Telegram Bots](https://core.telegram.org/bots#1-what-can-i-do-with-bots).
  
## Human chat
  
If for any reason your chatbot is not able to provide the resolution required by the customer, you can enable the option in the chat to chat to a human instead.
  
For the end user, this will not mean having to do anything, only that a member of staff from the company will be placed into the chat using [Conversations](https://www.infobip.com/docs/conversations).
  
See how to do this in [Answers](https://www.infobip.com/docs/answers/chatbot-elements/channels)for more information.
  
## Outbound messages  
### Text [#text-outbound-messages]
  
Text messages can contain a maximum of 4,096 characters.
  
### Image [#image-outbound-messages]
  
The file size must be a maximum of 5 MB. Supported formats are .jpg and .png.
  
### Audio [#audio-outbound-messages]
  
The file size must be a maximum of 10 MB. Supported formats are .m4a and .mp3.
  
### Video [#video-outbound-messages]
  
The file size must be a maximum of 10 MB. Supported format is .mp4.
  
### File [#file-outbound-messages]
  
The file size must be a maximum of 10 MB. Supported format is .pdf.
  
## Inbound messages
  
End users can send you the following types of messages:
  
- Text
- Image
- Audio
- Video
- File