vmail is slow or does not notify cell phone. replaced vmail and check all trunks for dial tone. customer has 4 lines, if I dial 9 from a phone I get line 4 all other trunks are out of service.I have sent a voice mail and watched the lights on the phone message light lights but does not grab line 4 or 3 or 2 or 1 but sometimes it works. been in the business 45 years but this one has be stumped. any ideas???