It is possible to interact with external programs from within VBA - Access or any other VBA-enabled application. Each of the many million possible external programs has its own API though, so you need to :
- Find a program that you'd like to use.
- Investigate its API to determine what is required in order to get it to do as you require.
If it helps, though I have no direct experience with dialling phones from software, I'd be surprised if there weren't a viable option out there somewhere. Maybe MyPhoneExplorer even could be it.
WiboData:
Then what is the command to use?
Until you get the preparatory work done that's not even a question that is possible to answer. It will depend on the API of the software you want to use. No-one here is an expert in PC-controlled telephony. We only help within the confines of the subject of the forum - This one is Access & VBA.
You may get lucky & find someone with an overlap of the technology you need, but that would certainly be lucky.
WiboData:
can you show a sample program?
No. Sometimes we do when the circumstances require it. We do try to avoid simply doing your work for you though. Instead we look to get you to the point where you are capable of doing your own work. Sometimes there's an overlap but that's very rare when a member starts by asking for it.
See
Application Automation for help with some general concepts for handling such stuff from VBA.