If an internal caller creates a conference (calls two parties, joins them all to a conference) it works fine.
If an external caller calls an internal caller, and then the internal caller tries to join a third party to a conference (doesn't matter if it is an external call or an outside call), the original caller gets dropped and hears three tones continiously (it sounds like the tones you would get at the beginning of a wrong number message from the telco), and the internal caller and the person who was called can hear each other fine.
Any ideas? Conferencing seems to be ok since the internal caller can create a conference with external, internal or a combination as long as the internal caller initiates the call.
If an external caller calls an internal caller, and then the internal caller tries to join a third party to a conference (doesn't matter if it is an external call or an outside call), the original caller gets dropped and hears three tones continiously (it sounds like the tones you would get at the beginning of a wrong number message from the telco), and the internal caller and the person who was called can hear each other fine.
Any ideas? Conferencing seems to be ok since the internal caller can create a conference with external, internal or a combination as long as the internal caller initiates the call.