the incoming calls are on vibrator I use the phone myself and i set my phone on vibrator SO i can feel the phone ringing and know the difference which is AIM and which is the phone my phone is set on high speed strobe ringing so i know thats for the phone, whilist i have the other one for AIM at long doopler buzzing. and i have my e mail at one pulse setting, and my txt msg at 2 pulse setting so i know all the difference of which is an incoming status..... So u can't say the SK is impossible to have an in coming call...
as for the relay if someone's calling and its a voice caller then theres two ways to go abt this tell them to e mail u or call u at home. simple. cuz u know ur not at home. and unless its an emergency i know someone will make it importantn to get across you. theres MANY ways for connection and MANY ways for the caller to recive any information nesscasry it doesn't always have to be the tty. thats IMO 
