Problems with AT commands – ATD | Miscellaneous › Others › Problems with AT commands – ATD This topic has 1 reply, 2 voices, and was last updated 10 years, 9 months ago by midhun. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts February 24, 2012 at 6:35 pm #1636 FabioParticipant Good afternoon everyone …. I am sending the following commands to my GPRS module (SIM 340) AT r > AT OK ATD xxxxxx; r > ATD OK Until then no problem, I can make a voice call, but as I do I know if the line is busy, when you call and nobody answers …. thank you June 19, 2012 at 1:17 pm #8079 midhunParticipant “Until then no problem, I can make a voice call, but as I do I know if the line is busy, when you call and nobody answers ….”, Then what should be happened??? Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In