Subscribe to MWI expires early?

Asterisk Asterisk Support
1

We are using the mailboxes in the AOR table so our Cisco phones can subscribe to Message Waiting Indications.
Once in a while the light would not be on even with new messages, so I did a trace with wireshark and found something weird.

The phone boots and subscribe sucessfully to MWI with a voicemail subscribe interval of 86400.
If I look at my wireshark trace I can see that asterisk sends a sollicited notify 5 times. Is this normal?
I have also noticed that the Subscription state is going from 83544 seconds to 432 seconds and it expires in the last notify.

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2

We’d need to see the initial SUBSCRIBE and full SIP flow, but it certainly sounds wrong from first look.

3

Here is my sucessful subscribe:

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Should I open an issue on jira?

4

If it would make it easier to examine logs, sure. As it is the SUBSCRIBE and the NOTIFY are from two different subscriptions and would have different lifetimes.