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Please find the error response below:

HTTP Response
=============
status code: 429
server: nginx
Date: Wed, 27 Apr 2022 17:17:34 GMT
Content-Type: application/json;charset=utf-8
Content-Length: 161
Connection: keep-alive
RCRequestId: edfe64b6-c64d-11ec-995d-0050568d1600
RoutingKey: IAD01P18PAS04
Retry-After: 2
Content-Language: en-US
X-Rate-Limit-Group: sms
X-Rate-Limit-Limit: 60
X-Rate-Limit-Remaining: 53
X-Rate-Limit-Window: 60

{
"errorCode" : "MSG-305",
"message" : "Request rate exceeded",
"errors" : [ {
"errorCode" : "MSG-305",
"message" : "Request rate exceeded"
} ]
}

HTTP Request
============
HTTP POST https://platform.ringcentral.com/restapi/v1.0/account/~/extension/~/sms

Can you please help us in finding the root cause?
@Nirmal Babu This response is actually coming from our API gateway which helps us manage the throughput of any given operation or endpoint. Your application is being "throttled" meaning it is sending too many requests within a given time window. The error will go away in time. To learn more about throttling and rate limits, go here:

https://developers.ringcentral.com/guide/basics/rate-limits

Does this answer your question?
I posted an answer below, but a colleague of mine followed up with me to let me know that he observed some irregularities in your example above, so we are investigating further.
Since the /sms endpoint rate limit group is Medium, meaning 40 API calls (40 messages) per 60 seconds. You should call the endpoint following the Medium rate limit. The best approach is to send a message every 1.5 secs (DO NOT calling as fast as possible then wait for the next window)

Please read [this article][1] and use the 2 option (Call and wait based on the average rate limit)

The header returns a special sms group which may not be applied to your app and we are investigate this.


[1]: https://medium.com/ringcentral-developers/ringcentral-api-rate-limit-explained-2280fe53cb16
From the error, we can see that the rate limit is not exceeded but why did it say 'Rate limit exceeded'?
X-Rate-Limit-Limit: 60
X-Rate-Limit-Remaining: 53
Usually, when the rate limit is exceeded, we see the X-Rate-Limit-Remaining value to be 0. But that is not the case here. I guess you are investigating the same, any update on this?

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