i've 5.1 (Pub&Sub) and all sccp phones. Last couple of days am facing problem with phones. Phone do not give the dial tone, i discovered if i take out SUBscriber from my network they work, but all devices repeatedly reregister themselves with the CM frequently.
My Priority for registration is first SUB and then PUB.
I noticed, one of the hard drive of my SUBscriber is not working so kept the SUB out of my network and changed the priority of registration to PUB first in the CM. But the phones still behave same.( re register with the CM)
Is this a bug in 5.1?
i think u have to take a look at ur network and check voice vlan and monitor ur switches sometimes broadcast storms on voice VLAN cause the IP phones to re-register with CCM.
generally once an ip phone lose its keepalives with its configured CCM, it tries to re-register with the configured prioritised CCM list.
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