Unsupported DP 750

[Phil OE]

Hello,
Out of the blue all 3 of my dp 750 phones have gone to sip registration no. Nothing has changed. No IP changes or anything.

 

[Evolute IT]

The DP75x series is not supported by 3CX. You will need to contact Grandstream or use the Grandstream Forums.

 

[Phil OE]

Randomly started working again.