Silence when answering calls between phones in the office

[comp4all]

Hi All,

I Installed a new system using Google cloud deployment.
the office has 4 GrandStream GPX1630 phones.
everything works fine besides the internal calls.
when 1 phone calls the other we hear silence.

any ideas?

TIA

 

[JohnS_3CX]

Hi @comp4all

If these are STUN phones, you will need to enable "PBX Delivers Audio" on these extensions.

You will also have to make sure that each extension has a unique SIP port, and unique RTP port ranges.