> ## Documentation Index
> Fetch the complete documentation index at: https://cosmos-docs-sync-security-docs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Events

> An overview of all events related to the callbacks middleware. There are two types of events, "ibcsrccallback" and "ibcdestcallback".

An overview of all events related to the callbacks middleware. There are two types of events, `"ibc_src_callback"` and `"ibc_dest_callback"`.

## Shared Attributes

Both of these event types share the following attributes:

|       **Attribute Key**      |                                     **Attribute Values**                                    |    **Optional**    |
| :--------------------------: | :-----------------------------------------------------------------------------------------: | :----------------: |
|            module            |                                        "ibccallbacks"                                       |                    |
|        callback\_type        | **One of**: "send\_packet", "acknowledgement\_packet", "timeout\_packet", "receive\_packet" |                    |
|       callback\_address      |                                            string                                           |                    |
|  callback\_exec\_gas\_limit  |                                 string (parsed from uint64)                                 |                    |
| callback\_commit\_gas\_limit |                                 string (parsed from uint64)                                 |                    |
|       packet\_sequence       |                                 string (parsed from uint64)                                 |                    |
|       callback\_result       |                               **One of**: "success", "failure"                              |                    |
|        callback\_error       |                              string (parsed from callback err)                              | Yes, if err != nil |

## `ibc_src_callback` Attributes

|   **Attribute Key**  |   **Attribute Values**   |
| :------------------: | :----------------------: |
|   packet\_src\_port  |   string (sourcePortID)  |
| packet\_src\_channel | string (sourceChannelID) |

## `ibc_dest_callback` Attributes

|   **Attribute Key**   |  **Attribute Values**  |
| :-------------------: | :--------------------: |
|   packet\_dest\_port  |   string (destPortID)  |
| packet\_dest\_channel | string (destChannelID) |