I have SPA9000 system with SPA504G and SPA400. There are 4 PSTN line come in to SPA400 for the same phone number. I have problem making conference call. If I make conference call, one of the phone drop and only 2 phone can connect.
Here is how tried. Make call from first phone to 2nd phone and then press "Conf". then dial another thrid phone extension and press "Conf", then menu change to "Join". I press "Join" and frist phone drop the line while 2nd phone and 3rd phone got connection.
Does my sequence wrong? I cannot make 3 phone conf call. Thanks in advance for your help.
