How can Adhearsion talk to landline or cell phones without special hardware?
This is usually so simple that it can catch people by surprise. With the proliferation of VoIP over the past few years, many VoIP providers have sprung up which offer very inexpensive so-called “termination” services. Skype and Vonage are popular examples of these. The term “termination” simply means that they operate the technologies that turn a VoIP call made up of internet packets into a phone call on the entirely separate public telephone network. When funneling all calls through a service provider like this, it’s often called “trunking” because, like the trunk of a tree, the many branches converge into one big point all the way to the ground where the roots then branch from the tree. The following diagram should help illustrate how it works. The VoIP protocol most often used for the VoIP calling is called Session Initiation Protocol or SIP. If you’re looking for services which offer this, try googling for “sip trunk” or “sip termination service” or you may find a list here.
