> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telemetron.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Messaging Channel Nuances

> Limitations and behavior differences across each messaging channel

Each channel has its own quirks. This page covers what's non-obvious.

## Email

* Replies auto-CC all recipients on the thread. Email addresses synced in Telemetron (e.g., your Gmail Groups integration addresses) are filtered from CC automatically.

## Instagram

* **Short message limit** on DMs — messages over \~250 characters may fail to send.
* **24-hour messaging window** — you can only reply within 24 hours of the customer's last message.
* **Comment replies** have a 7-day window. You can reply publicly as a comment or privately via DM.
* Text and attachments can't be sent in the same message — attachments go as a separate message.
* Story mentions create cases and replies go via DM.

## Facebook

* **24-hour messaging window** on Messenger, same as Instagram.
* **Post comments** can be replied to publicly or privately via DM.
* Text and attachments can't be sent together, same as Instagram.
* Ad/promoted post comments are tracked separately with promotion status.

## Phone

Phone is not a messaging channel — calls are tracked as cases with recordings and voicemail. Outbound calls require agent phone number configuration. Call routing uses priority and availability settings. See [Phone Integration](/integrations/communication/phone) for setup.