### Denial of Service Timer

The Denial of Service Subscription Timer limits the number of subscription updates requested by the trusted subscription service. The Push Agent following a successful subscription will accept only one subscription request per minute. This implies that the Push Agent in the telephone can handle one subscription request per minute.

The denial of service timer starts following a Push Request for Subscribe. No Subscribe request is accepted for the next minute. If another Subscribe request is received within that time, the response is as follows:

Parameter | Status Code | Reason Phrase
HTTP Status Code | 200 | “OK”
x-Push-Status | 503 | “Service Unavailable”