The application works well with the Windows-based 3CX IP-PBX system, but since it's SIP-based it should work with other SIP-based IP-PBXs as well. Of course, this is paid "licensed" software, and I should point out that you can get free wake-up calls on Asterisk using Nerd Vittles wake-up call recipe that I wrote about. With this particular solution you can dial into the Asterisk system and after entering in your PIN you can actually speak (speech recognition) the date & time you want along with your calendar reminder message and the system will record the reminder into the calendar.
The www.sipservices.gr website is a little sparse, and English isn't the primary language since I see typos and grammatical errors all over the place. Obviously, an entrepreneur/one-man shop, but I don't hold that against him or her. Though I did cringe a little when I read on their website that it uses a Microsoft Access (.mdb) back-end database. Well, I guess that keeps the license fees down vs say Oracle or MS SQL Server.
In the past, wake-up call systems required dedicated analog ports on the PBX connected to a 3rd party adjunct system running the wake-up calling hardware and software, including expensive telephony cards. With VoIP, you still require software and a PC to run the application, but the need for telephony hardware is gone. It's all done over SIP. I'm surprised I haven't seen more SIP-based wake-up calling software applications. I'm sure Cisco. Avaya, and Nortel offer a wake-up calling application for vertical markets such as hotel chains, but they probably charge an arm & a leg. Go check it out.]]>