I have a customer who wants to be able to press a button on their phone and automatically access a phone line, just like their old Key System behaved. I've tried to convince them that PBX mode offers more flexibility, but it's not happening, so no need to discuss that.
I am integrating AT&T's IP Flex circuit into the system. Is it possible to run the UC540 in Key System mode with the IP Flex trunk? Is there another way to accomplish this in PBX mode?
Please let me know ASAP.