On 02/28/2012 10:34 PM, MohitSoni wrote:

> I have found that some servers like Asterisk starts sending NOTIFY for
> simple-message-summary to the registered UA without the UA sends
> SUBSCRIBE for message-summay (RFC3842).

These are called 'unsolicited NOTIFY' messages.

> Is this a valid behavior?

What is your definition of 'valid'?

> Is there any draft or RFC in which this behavior is defined?

No. It's rather widely used, but not specified by any RFC.

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
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445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
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