[OpenSIPS-Users] [Presence] Empty NOTIFY received after re-subscription

[Pascal Maugeri]

Hi

After re-subscribing to a user presence, we receive immediately a NOTIFY
with no content:

NOTIFY sip:user1 at XX.XX.XX.XX:5060 SIP/2.0
Via: SIP/2.0/UDP YY.YY.YY.YY:6667;branch=z9hG4bK34ab.7700bc14.0
To: <sip:user1 at mycompany.com <sip%3Auser1 at mycompany.com>>;tag=14257163
From: <sip:user2 at mycompany.com <sip%3Auser2 at mycompany.com>
>;tag=9886f112d485ff608a79084eaa27a247-48fb
CSeq: 5 NOTIFY
Call-ID: 87cbad243e9c1b48c8333cbbb99cb282 at XX.XX.XX.XX
Route: <sip:YY.YY.YY.YY:6666;lr=on>
Content-Length: 0
User-Agent: OpenSIPS (1.5.2-notls (x86_64/linux))
Max-Forwards: 70
Event: presence
Contact: <sip:sa at YY.YY.YY.YY:6667>
Subscription-State: active;expires=100

 and then few seconds later I receive a NOTIFY with the proper presence
document.

Which are the possible reasons why the presence server sends an "empty"
NOTIFY ?

Cheers
Pascal
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