NEC SIP Phone GT890 (ITX-3370) disconnect problems

[zen83]

hello everybody
I work with SV9100 and NEC IP Phone DT900 Series and NEC SIP Phone
I have a problem with NEC SIP Phone gt890 ITX-3370 (android) and GT210 also
the problem is the sip phone suddenly disconnect progres call or unregisered at Sv9100 for a while and then reregister because when i call gt890 the SV9100 say somthing like "the number unreachable or un register or faken number"

 

[CoralTech]

Remote or on site?

 

[zen83]

@CoralTech
In site
With Vlans without priority for voice
SV9100 AND ALL EXTENSIONS are in the same VLAN
There is no problem with NEC DT900 series.
our Support said that GT890 big screen consum alot of power
We use POE+ ON CISCO SWITCHES
ALSO WE USE External power Adapter
But The problem didn't solve

 

[CoralTech]

Top numbered VLAN = highest priority. Make sure your switches have CDP off. How many are you running and if more than one is it across all of them? Also, I found this to be an issue in a couple places. Make sure the tablet is not rotating it's MAC address and drawing a new IP. This feature is a headache and should always be turned off.

To Disable MAC Randomization on Android Devices:
Open the Settings.
Tap Network & Internet -> Wi-Fi.
Tap the gear icon associated with your network.
Tap MAC address type.
Tap Phone MAC.
Re-join the network.

 

[zen83]

Tankx CoralTech
I found the problem
it was Bilt in ST500 App
St500 unstable
when I stop it and use phone App as a Default phone app
Gt890 become more stable