> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.ecall-messaging.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# SMS sender (callback)

# SMS sender (callback)

The callback defines the sender of the SMS message. In the eCall portal you can choose between three different SMS senders:

*  **numeric callback**: maximum 16 characters, e.g. «0041791234567»
*  **alphanumeric callback**: maximum 11 characters, e.g. «eCall»
*  **Number of eCall**: SMS message is received in the logbook of eCall


By default, your stored registration number is stored as the SMS sender. 
You need paid points to change the callback: Either buy points in the shop under _Buy points_ (prepaid) or open an eCall Business account (postpaid).

||| Would you like to test the callback function with your free account? We will be happy to set up your account accordingly. Please contact us by phone (+41 44 787 30 70) or e-mail ([office_ch@f24.com](mailto:office_ch@f24.com)).



# Changing the SMS sender

### Permanent change

Under _Settings / SMS Settings / Sending Options_ you can enter your numeric or alphanumeric callback for the option _Sender to be displayed to the recipient_.


![](https://storage.crisp.chat/users/helpdesk/website/eaa1358e28d0c000/screenshotecall-portalcallback_l9hf3g.png)



### One time change

For short-term changes to the callback of individual SMS transmissions, you can also change the callback at _Send / SMS/Pager / SMS Sender_. This callback is overwritten with the value stored in the settings when the send job is exited.


![](https://storage.crisp.chat/users/helpdesk/website/eaa1358e28d0c000/screenshotecall-portalcallback_qdphga.png)
 

# Sending via e-mail interface: Adjusting the callback in your account

In your account, select _Account settings / E-mail access_ and click the edit icon: 

![](https://storage.crisp.chat/users/helpdesk/website/eaa1358e28d0c000/screenshote-mail-schnittstelle_eu0zft.png)

Under _Reply options_ you will find the option _Own sender_, where you can store your desired callback:

![](https://storage.crisp.chat/users/helpdesk/website/eaa1358e28d0c000/screenshote-mail-schnittstelle_15oxq5o.png)



# Sending via e-mail interface: Setting a callback via additional command

By inserting certain keywords (commands) in the e-mail, you can trigger additional actions and thus also define a callback:
The following parameters (additional commands) are available here:


* **%Callback%**

The SMS sender that you have stored in your account settings is used in the message. You have a maximum of 16 characters for the numeric callback and 11 characters for the alphanumeric callback.

__Example:__
-	numeric callback: «0041791234567»
-	alphanumeric callback: «website.ch»


* **%Callback:%**

This parameter allows you to specify the SMS sender directly in the e-mail content.

__Example: __
E-mail content : "This is a message about %Callback:0041791234567% email access to eCall". 
E-mail view when receiving the message: "This is a message about e-mail access to eCall". The callback number is displayed on the mobile phone as 0041791234567.


* **%answer%**

With the command %Answer% you can instruct eCall to send along a callback number to which the recipient can send back an SMS reply. 
The answer appears in the logbook under _Received messages_ and is forwarded as an e-mail.

[More information about the answer parameter](https://help.ecall-messaging.com/en/article/answer-sms-but3es/)



||| **Note on the callback: **Depending on the receiving country and provider, it is recommended to use a numeric or alphanumeric callback. Do you need advice or detailed information on specific countries? We will be happy to provide you with personal advice by telephone (+41 44 787 30 70) or by e-mail (office_ch@f24.com).