Using RUT955 RS232 port in 'modem' mode outbound connections work fine, but the legacy devices I would like to support do not recognise the 'RING' string from an incoming connection, instead they use the analog modem 'auto-answer' function (controlled by 'ATS0' command) to accept incoming calls. It's not practicable to reprogram these old units to change their behaviour. Is there any simple way to add auto-answer functionality ( in effect, issuing the 'ATA' command to itself when it issues the 'RING' string) without building special non-standard firmware for it ?