Mitel 5300 unsupported phone lost inbound call

[Franky_Nubecom]

Hi All
I have configured a Mitel 5320 IP phone in SIP mode, it is working for outbound very well, but sometime in the inbound the phone is not receiving the call
reboot the phone and start to receiving inbound calls, after sometime I'm loosing one more time the inbound call. It is something like the keep alive, but not really sure

Thx

 

[N_G]

An Ip phone costs someething like 60 euros thesee days. These old MITEL phones will never work reliably. Why would you put yourself through this pain? If you have an office full of them, see who really needs an IP Phone (many will prefer smartphone for its flexibility) and buy new energy saving hardware for the rest....