Speakerphone page (Intercom)

[anonymous1712222627012]

Hello guys !

I just installed a new client of mine who's used to use the function "Intercom" or "Page" to the whole company.
My VoIP server is on a modified Asterisk basis. The shortcut i did on the server for the Page to all of her extension is *399 that is going to page extensions 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249 and 250 (this is the setup for the extension 213).
When i use the Line key type "Intercom" with value *399, all the phones do beep but no sounds come out of the internal speaker.
Is there a maximum number of extensions that can be paged at the same time ?

I've got:
- 28x T23G on the firmware 44.80.0.95
- 3x T46G on the firmware 28.80.0.95
- 2x W52P on 25.73.0.40

Thanks for your time.