Two IP Phone with Same Extension doesn't ring for Main Branch Number

[vivi]

I do have two IP phone with same extension both phone ring on same time when someone dial the extension but if someone dial main branch number then it rings only on one phone instead of both phone...how to make it ring on both IP phone when someone dial main branch number?

[Nithin Eluvathingal]

 when someone calling the Main Branch number is it the shared line or is it another line configured on the phone rings  ?

[Roger Kallberg]

You’d need to provide a little more details on your setup for us to give you any help on this. There is a few different options for how to achieve what you ask for. Start by mentioning the call processing system you have, details on the setup of the directory number(s) on the phones and also for the main number.