Dial-In:
This is a traditional conferencing practice where a host shares an email or an SMS invite detailing the bridge number and a unique PIN to every participant, which they use to dial-in to the teleconference. Anyone who has the bridge number and unique passcode can join the conference.
Dial-Out:
In this setup, the host will initiate the call to multiple people at the same time from a single phone, and the conference call begins as soon as the first participant answers their phone. It’s a more modern approach to the conference call, which circumvents the bridge number and PIN process, and ultimately saves businesses revenue and time.
Difference Between Dial-In & Dial-Out Conferencing
Though dial-in is mired with security challenges, its familiarity remains the primary selling point. There are a few dial-out conferencing apps that offer secure and efficient con-calls, without making the process complex – much like our conference calling app grptalk.

grptalk offers audio conferencing services with the flexibility to choose how you conference with both inbound and outbound calls. In dial-out calls, the participants just need to answer an incoming call to join the conference. If you choose the traditional dial-in method, grptalk sends SMS invites, along with bridge numbers, to all participants. They simply have to dial-in the PIN at the scheduled time.

Check out for :Audio Conferencing Price