Something does not match.
If you are using loop start protocol,that is a protocol used when you have simple, analog lines, with two wires each.
On that configuration, the only way to detect the start of conversation, is making the quintum detect the audio on the audio channel.
Bu the e&m protocol, is used in lines that have 4 wires or 6 wires to connect from the switch to the gateway.
I do think that the quintum analog gateways could handle e&m protocol.