How many types of acknowledgements are available for each channel?

Tauben_Tenty — Thu, 12 Feb 2026 14:39:01 GMT

All channels offer a ‘sent’ acknowledgement when a message is delivered to the platform. Using these acknowledgements customers can create fallbacks based on delivery and read acknowledgements.

The following table shows the type of acknowledgements, which are available for each channel:

	SENT	RECEIVED	READ
	Message received by platform	Message received by the apps on user’s device	User launched mobile/ social apps
SMS	Yes	N/A	N/A
MMS	Yes	Yes	N/A
RCS	Yes	Yes	Yes
WhatsApp	Yes	Yes	Yes
Facebook Messenger *	Yes	Yes	Yes
Instagram	Yes	Yes	Yes
Viber	Yes	Yes	Yes
KakaoTalk	Yes	Yes	No
Telegram	Yes	No	No
WeChat	Yes	No	No
LINE	Yes	No	No

* - For Facebook Messenger note that the READ receipt is only supported when the hosting is done outside EU.

Visit the Conversation API callbacks section of the Sinch Documentation site for more details about how acknowledgments or delivery reports work.

Learn more about Sinch Conversation API.

article How many types of acknowledgements are available for each channel? in Conversation API

How many types of acknowledgements are available for each channel?