I have a ModKey with the 4 extra CO lines and 8 extra extentions. The system is in default opperation. I've wired up and installed two 60083s that work perfectly. I also have some 60080s and 1 60010B. Those will ring other extensions and will ring on incoming calls, but will not dial out. The buttons on the top of side of these phones seem to have line appearance but I never can get dial tone. I have no way of knowing if these phones are bad as all this equipment is second hand. Is there a key press sequence to get an external line with the 60080 and 60010B phone sets? Something other than pressing a line key?
Thanks