Dear Support,
We faced the problem with phone lock up on the SPA5xx phones when presence (BLF) option is used.
I read some similar topics about phone lock-ups and did not found any issue that is somehow related to presence, but in our case it is related to BLF option configured on the phone or Attendant console.
It looks like the phone is locking up after about 2 hours of normal operation when Attendant Console configured to monitor other extensions' status (BLF+CP+SD). The phone is locked up only on user interface: no buttons can be used, no calls can be accepted or made, no answers to server messages, no registration. At the same time Web interface still accessible, except configuration changes and reboot. Only power reboot brings the phone to life again. It happens about every 2 hours. When BLF option is off, the phone works normally.
We made investigations and found that the phone locks up on some Notify messages and it is somehow related to Subscribtion expiration time (7200s=2h). We found a workaround by decreasing expiration timeout to 20sec on the server side, but it is certanly a Cisco Phone bug !!!
I can send network traces and phone debugs, but there is nothing except that the phone stops answering to the server requests at the moment of lock up.
Regards,
Ivo Koimecs
P.S.
we tested on Cisco SPA504G and SPA508G phones with different hardware and software combination with the same result:
Cisco SPA508G IP Phone
HW: 1.0.0(0001)
SW: 7.4.4, 7.4.6 and the latest 7.4.7
Cisco SPA504G IP Phone
HW: 1.0.2(0001)
SW: 7.4.4, 7.4.6 and the latest 7.4.7
Plus two different sidecars (changed between the phones): Cisco SPA500S Attendant Console
HW: 1.0.6
SW: 2.0.2
