[SOLVED] SIM900 ATH and voicemail problem

[dgleeson]

Hi Guys

Im currently changing from SIM300DZ to SIM900D.

One feature of our product is where the person calls from their mobile, the SIM300DZ hangs up once it sees the RING. Our device looks at the number and if the number is an expected number it switches a relay.

On the SIM300DZ all this works fine - no problems.

On the SIM900D the ATH command is terminating the call but the remote phone making the call is trying to get into voicemail. As I have turned voice mail off through the provider, its just getting "the person you have called does not have voicemail set up"

Why is the operation with the SIM900D different here. Is it something to do with the time after the call is placed before we issue the ATH? Is it related to a voicemail number on the SIM? Not sure where to start.

Any help appreciated.

Thanks

Denis

 

[dgleeson]

Ok I think I have this.

It appears to be related to the time delay before going to voice mail.

This is a network setting or may be a SIM setting. Not sure which.

Why its different on different modules I dont know.

Denis