Hello All,

I am subscribing to message-summary events and then, at a later time,
unsubscribing.

Here is the unsubscribe scenario:

1) My UA invokes nua_unsubscribe().
2) Sofia-sip correctly transmits the SUBSCRIBE message with Expires=0
3) The SIP server replies to this with a 401 Unauthorized Message
4) Sofia-sip re-sends the SUBSCRIBE message with authorization, but
   WITHOUT the Expires field (SHOULD STILL BE Expires=0)
5) Sofia-sip reports Event Callback: 100 Request Authorized by Cache
6) The SIP server replies with 489 Event Header Missing

Is this a bug?  Or am I doing something wrong?

Best Regards,
Jerry

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