Overview

VOD sends notification messages to notify you of the execution status of tasks such as transcoding and snapshot capturing in real time.

Currently, two notification services are available: MFS and SMN. If you are a new user, MFS is used by default. To use SMN, submit a service ticket.

The following table lists the differences between MFS and SMN.

**Table 1** Service differences
Difference	MFS	SMN
Region restriction	MFS is not supported in CN North-Beijing1 and CN East-Shanghai2.	None
Timeliness	High, usually within 5 minutes.	Medium. Queuing occurs during global peak hours, and a delay of more than 10 minutes occurs occasionally.
Billing	Free of charge	SMN charges messages separately. For details, see SMN Pricing Details.
Notification mode	Only REST messages can be sent.	Multiple types of messages, such as SMS messages, emails, and REST messages, can be sent.
JSON message body	Figure 1 shows an example of JSON message body.	Figure 2 shows an example of JSON message body.