I'm with WorldxChange VoIP service. Dynalink RTA1046VW Router and Uniden XDECT R055 dual line phone. Have an occasional problem where I call and get Voice Mail, hear the greeting, but can't leave a message. Sometimes I get 'Thank you for your call' or just a beep and end of service. Does this sound like a modem setting that needs changing? Unfortunately I'm not sure whether this only happens with voice mail services or answer phones or both. Any suggestions gratefully received!